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 U.S. Sen. Bernie Sanders, D-VT, walks toward the stage for a presidentialy campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. The rally was Sanders’ first campaign event since his heart attack on Oct. 1.

U.S. Sen. Bernie Sanders, D-VT, walks toward the stage for a presidentialy campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. The rally was Sanders’ first campaign event since his heart attack on Oct. 1.

 U.S. Sen. Elizabeth Warren, D-MA, talks about her policy plans during a rally, Monday, Sept. 16, 2019, in New York. Warren held the rally in Washington Square Park near the site of the Triangle Shirtwaist Factory fire.

U.S. Sen. Elizabeth Warren, D-MA, talks about her policy plans during a rally, Monday, Sept. 16, 2019, in New York. Warren held the rally in Washington Square Park near the site of the Triangle Shirtwaist Factory fire.

 U.S. Sen Bernie Sanders, D-VT, and U.S. Rep. Alexandria Ocasio-Cortez, D-NY, wave to the crowd during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Ocasio-Cortez officially endorsed Sanders for president at a rally near the Queensbridge Houses, the largest public housing project in the country.

U.S. Sen Bernie Sanders, D-VT, and U.S. Rep. Alexandria Ocasio-Cortez, D-NY, wave to the crowd during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Ocasio-Cortez officially endorsed Sanders for president at a rally near the Queensbridge Houses, the largest public housing project in the country.

 U.S. Sen. Elizabeth Warren, D-MA, walks onstage during a presidential campaign rally that drew an estimated 20,000 supporters, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Elizabeth Warren, D-MA, walks onstage during a presidential campaign rally that drew an estimated 20,000 supporters, Monday, Sept. 16, 2019, in New York.

 U.S. Sen. Bernie Sanders, D-VT, smiles as the crowd cheers for him at a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders reaffirmed his commitment to fight for the working class to an estimated crowd of 25,000 supporters, and said he’s feeling healthier than ever.

U.S. Sen. Bernie Sanders, D-VT, smiles as the crowd cheers for him at a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders reaffirmed his commitment to fight for the working class to an estimated crowd of 25,000 supporters, and said he’s feeling healthier than ever.

 U.S. Sen. Elizabeth Warren, D-MA, talks about her plans to take on corruption during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Elizabeth Warren, D-MA, talks about her plans to take on corruption during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

 U.S. Sen. Bernie Sanders, D-VT, lays out his progressive agenda for the presidency during a rally that drew an estimated 25,000 supporters, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders gained a critical endorsement from U.S. Rep. Alexandria Ocasio-Cortez, D-NY, one of Congress’ rising progressive stars.

U.S. Sen. Bernie Sanders, D-VT, lays out his progressive agenda for the presidency during a rally that drew an estimated 25,000 supporters, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders gained a critical endorsement from U.S. Rep. Alexandria Ocasio-Cortez, D-NY, one of Congress’ rising progressive stars.

 New York State Sen. Alessandra Biaggi announces her support for U.S. Sen. Elizabeth Warren, D-MA, alongside New York Assemblywoman Yuh-Line Niou during a presidential campaign rally, Monday, Sept. 16, 2019, in New York. Biaggi and Niou were part of a progressive wave that swept out incumbents throughout the state. Biaggi ousted longtime incumbent Jeffrey Klein who was behind the Independent Democratic Conference, a breakaway group of Democrats that caucused with Republicans in Albany.

New York State Sen. Alessandra Biaggi announces her support for U.S. Sen. Elizabeth Warren, D-MA, alongside New York Assemblywoman Yuh-Line Niou during a presidential campaign rally, Monday, Sept. 16, 2019, in New York. Biaggi and Niou were part of a progressive wave that swept out incumbents throughout the state. Biaggi ousted longtime incumbent Jeffrey Klein who was behind the Independent Democratic Conference, a breakaway group of Democrats that caucused with Republicans in Albany.

 U.S. Rep. Alexandria Ocasio-Cortez, D-NY, announces her endorsement of U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

U.S. Rep. Alexandria Ocasio-Cortez, D-NY, announces her endorsement of U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

 U.S. Sen. Bernie Sanders, D-VT, center, greet supporters at the end of a presidential campaign rally that drew an estimated 25,000 people, Saturday, Oct. 19, 2019, in the Queens borough of New York.

U.S. Sen. Bernie Sanders, D-VT, center, greet supporters at the end of a presidential campaign rally that drew an estimated 25,000 people, Saturday, Oct. 19, 2019, in the Queens borough of New York.

 A crowd of nearly 25,000 people listen to U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

A crowd of nearly 25,000 people listen to U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

 Supporters of U.S. Sen. Elizabeth Warren, D-MA, cheer during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

Supporters of U.S. Sen. Elizabeth Warren, D-MA, cheer during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

 U.S. Sen. Bernie Sanders, D-VT, talks to a crowd of nearly 25,000 people during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

U.S. Sen. Bernie Sanders, D-VT, talks to a crowd of nearly 25,000 people during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

 Progressive activist Tiffany Cabán waits backstage before walking onstage to announce her support for U.S. Sen. Bernie Sanders during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Cabán rose to prominence during a close race for Queens district attorney.

Progressive activist Tiffany Cabán waits backstage before walking onstage to announce her support for U.S. Sen. Bernie Sanders during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Cabán rose to prominence during a close race for Queens district attorney.

 A presidential campaign rally for U.S. Sen. Elizabeth Warren, D-VT, filled Washington Square Park with a crowd of approximately 20,000 people, Monday, Sept. 16, 2019, in New York.

A presidential campaign rally for U.S. Sen. Elizabeth Warren, D-VT, filled Washington Square Park with a crowd of approximately 20,000 people, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Bernie Sanders, D-VT, walks toward the stage for a presidentialy campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. The rally was Sanders’ first campaign event since his heart attack on Oct. 1.

U.S. Sen. Elizabeth Warren, D-MA, talks about her policy plans during a rally, Monday, Sept. 16, 2019, in New York. Warren held the rally in Washington Square Park near the site of the Triangle Shirtwaist Factory fire.

U.S. Sen Bernie Sanders, D-VT, and U.S. Rep. Alexandria Ocasio-Cortez, D-NY, wave to the crowd during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Ocasio-Cortez officially endorsed Sanders for president at a rally near the Queensbridge Houses, the largest public housing project in the country.

U.S. Sen. Elizabeth Warren, D-MA, walks onstage during a presidential campaign rally that drew an estimated 20,000 supporters, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Bernie Sanders, D-VT, smiles as the crowd cheers for him at a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders reaffirmed his commitment to fight for the working class to an estimated crowd of 25,000 supporters, and said he’s feeling healthier than ever.

U.S. Sen. Elizabeth Warren, D-MA, talks about her plans to take on corruption during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Bernie Sanders, D-VT, lays out his progressive agenda for the presidency during a rally that drew an estimated 25,000 supporters, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders gained a critical endorsement from U.S. Rep. Alexandria Ocasio-Cortez, D-NY, one of Congress’ rising progressive stars.

New York State Sen. Alessandra Biaggi announces her support for U.S. Sen. Elizabeth Warren, D-MA, alongside New York Assemblywoman Yuh-Line Niou during a presidential campaign rally, Monday, Sept. 16, 2019, in New York. Biaggi and Niou were part of a progressive wave that swept out incumbents throughout the state. Biaggi ousted longtime incumbent Jeffrey Klein who was behind the Independent Democratic Conference, a breakaway group of Democrats that caucused with Republicans in Albany.

U.S. Rep. Alexandria Ocasio-Cortez, D-NY, announces her endorsement of U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

U.S. Sen. Bernie Sanders, D-VT, center, greet supporters at the end of a presidential campaign rally that drew an estimated 25,000 people, Saturday, Oct. 19, 2019, in the Queens borough of New York.

A crowd of nearly 25,000 people listen to U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

Supporters of U.S. Sen. Elizabeth Warren, D-MA, cheer during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.

U.S. Sen. Bernie Sanders, D-VT, talks to a crowd of nearly 25,000 people during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.

Progressive activist Tiffany Cabán waits backstage before walking onstage to announce her support for U.S. Sen. Bernie Sanders during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Cabán rose to prominence during a close race for Queens district attorney.

A presidential campaign rally for U.S. Sen. Elizabeth Warren, D-VT, filled Washington Square Park with a crowd of approximately 20,000 people, Monday, Sept. 16, 2019, in New York.

 U.S. Sen. Bernie Sanders, D-VT, walks toward the stage for a presidentialy campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. The rally was Sanders’ first campaign event since his heart attack on Oct. 1.
 U.S. Sen. Elizabeth Warren, D-MA, talks about her policy plans during a rally, Monday, Sept. 16, 2019, in New York. Warren held the rally in Washington Square Park near the site of the Triangle Shirtwaist Factory fire.
 U.S. Sen Bernie Sanders, D-VT, and U.S. Rep. Alexandria Ocasio-Cortez, D-NY, wave to the crowd during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Ocasio-Cortez officially endorsed Sanders for president at a rally near the Queensbridge Houses, the largest public housing project in the country.
 U.S. Sen. Elizabeth Warren, D-MA, walks onstage during a presidential campaign rally that drew an estimated 20,000 supporters, Monday, Sept. 16, 2019, in New York.
 U.S. Sen. Bernie Sanders, D-VT, smiles as the crowd cheers for him at a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders reaffirmed his commitment to fight for the working class to an estimated crowd of 25,000 supporters, and said he’s feeling healthier than ever.
 U.S. Sen. Elizabeth Warren, D-MA, talks about her plans to take on corruption during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.
 U.S. Sen. Bernie Sanders, D-VT, lays out his progressive agenda for the presidency during a rally that drew an estimated 25,000 supporters, Saturday, Oct. 19, 2019, in the Queens borough of New York. Sanders gained a critical endorsement from U.S. Rep. Alexandria Ocasio-Cortez, D-NY, one of Congress’ rising progressive stars.
 New York State Sen. Alessandra Biaggi announces her support for U.S. Sen. Elizabeth Warren, D-MA, alongside New York Assemblywoman Yuh-Line Niou during a presidential campaign rally, Monday, Sept. 16, 2019, in New York. Biaggi and Niou were part of a progressive wave that swept out incumbents throughout the state. Biaggi ousted longtime incumbent Jeffrey Klein who was behind the Independent Democratic Conference, a breakaway group of Democrats that caucused with Republicans in Albany.
 U.S. Rep. Alexandria Ocasio-Cortez, D-NY, announces her endorsement of U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.
 U.S. Sen. Bernie Sanders, D-VT, center, greet supporters at the end of a presidential campaign rally that drew an estimated 25,000 people, Saturday, Oct. 19, 2019, in the Queens borough of New York.
 A crowd of nearly 25,000 people listen to U.S. Sen. Bernie Sanders, D-VT, during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.
 Supporters of U.S. Sen. Elizabeth Warren, D-MA, cheer during a presidential campaign rally, Monday, Sept. 16, 2019, in New York.
 U.S. Sen. Bernie Sanders, D-VT, talks to a crowd of nearly 25,000 people during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York.
 Progressive activist Tiffany Cabán waits backstage before walking onstage to announce her support for U.S. Sen. Bernie Sanders during a presidential campaign rally, Saturday, Oct. 19, 2019, in the Queens borough of New York. Cabán rose to prominence during a close race for Queens district attorney.
 A presidential campaign rally for U.S. Sen. Elizabeth Warren, D-VT, filled Washington Square Park with a crowd of approximately 20,000 people, Monday, Sept. 16, 2019, in New York.