2020 United States presidential election

Democratic presidential candidate Sen. Amy Klobuchar, D-Minn., responds to a question she pulled from a bucket during a campaign stop, Friday, Nov. 22, 2019, in Henniker, N.H. (AP Photo/Mary Schwalm)

FILE - In this Nov. 30, 2018 file photo, former New York Mayor Michael Bloomberg speaks with members of the media at The Bridge Way School in Philadelphia. With Bloomberg now running for president, the news service that bears his name said Sunday, Nov. 24, 2019, it will not “investigate” him or any of his Democratic rivals, and Bloomberg Opinion will no longer run unsigned editorials. (AP Photo/Matt Rourke)

FILE - In this Feb. 26, 2019, file photo, former New York City Mayor Michael Bloomberg speaks at a news conference at a gun control advocacy event in Las Vegas. Tennessee’s top election officials say Bloomberg has requested a petition that would require securing 2,500 signatures from registered voters in less than a month if he wants to qualify for the state’s Democratic presidential primary ballot. The secretary of state’s office confirmed Wednesday, Nov. 13, that Bloomberg requested the ballot petition earlier this week. (AP Photo/John Locher, File)

FILE - In this Dec. 1, 2016 file photo, former New York City Mayor Michael Bloomberg takes part in an event discussing Mexico's relationship to the U.S., in Mexico City. With Bloomberg now running for president, the news service that bears his name said Sunday, Nov. 24, 2019, it will not “investigate” him or any of his Democratic rivals, and Bloomberg Opinion will no longer run unsigned editorials. (AP Photo/Marco Ugarte)

Former New York City Mayor Michael Bloomberg poses for his candidate photo as he files paperwork, Tuesday, Nov. 12, 2019, at the state Capitol in Little Rock, Ark., to appear on the ballot in Arkansas' March 3 presidential primary. Bloomberg hasn't formally announced a bid for the Democratic presidential nomination, but his trip to Arkansas is the latest indication that he is leaning toward a run. (Staton Breidenthal/The Arkansas Democrat-Gazette via AP)

Democratic presidential candidate Sen. Kamala Harris, D-Calif., speaks to a crowd during a "Black Women's Weekend of Action" event at Benedict College, on Saturday, Nov. 23, 2019, in Columbia, S.C. (AP Photo/Meg Kinnard)

FILE - In this Oct. 31, 2019, file photo, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., gestures during a rally after filing to be listed on the New Hampshire primary ballot at the Statehouse in Concord, N.H. Sanders has consistently remained among the Democratic primary front runners. But perhaps no state will test his durability more than New Hampshire, where he trounced Hillary Clinton by 22-points in 2016 and now may find himself a victim of that success since repeating such a dominate performance seems unthinkable. (AP Photo/Charles Krupa, File)

Former Vice President and Democratic presidential candidate Joe Biden speaks at a town hall held at Lander University on Thursday, Nov. 21, 2019, in Greenwood, S.C. (AP Photo/Meg Kinnard)

Pete Buttigieg, left, speaks with the Rev. Al Sharpton at a breakfast event on Thursday, November 21, 2019, in Atlanta. Buttigieg, along with Cory Booker, Amy Klobuchar, Andrew Yang and Tom Steyer, all presidential hopefuls, spoke at the event hosted by the Sharpton's National Action Network. (AP Photo/ Ron Harris)

Democratic presidential hopeful Joe Biden, center, leaves Food for the Soul restaurant with South Carolina Democratic Party Chairman Trav Robertson, left, and state director Kendall Corley, right, after filing paperwork for the South Carolina primary on Friday, Nov. 22, 2019, in Abbeville, S.C. (AP Photo/Meg Kinnard)