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Democratic presidential candidate former Vice President Joe Biden with Jill Biden at a caucus night campaign rally on Monday, Feb. 3, 2020, in Des Moi...

Democratic presidential candidate former Vice President Joe Biden at a caucus night campaign rally on Monday, Feb. 3, 2020, in Des Moines, Iowa with J...

Democratic presidential candidate former Vice President Joe Biden wishes Barbara Moroney, of Rocky Point, N.Y., a happy 80th birthday on the phone dur...

TOPSHOT - US Presidential candidate and former US Vice President Joe Biden gestures as he addresses supporters and curious voters at the IBEW Local 49...

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., with his wife Jane O'Meara Sanders, speaks to supporters at a caucus night campaign rall...

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., with his wife Jane O'Meara Sanders, speaks to supporters at a caucus night campaign rall...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

President Donald Trump listens as Speaker of the House Nancy Pelosi speaks during the 68th Annual National Prayer Breakfast at the Washington Hilton o...

Tiffany Trump attends the State of the Union address at the US Capitol in Washington, DC, on February 4, 2020. (Photo by Olivier DOULIERY / AFP)

TOPSHOT - President Donald Trump pumps his fist as he delivers the State of the Union address in the chamber of the US House of Representatives at the...

TOPSHOT - President Donald Trump waves after delivering his State of the Union address in the chamber of the US House of Representatives at the US Cap...

A U.S. Air Force B-52H Stratofortress from Minot Air Force Base, N.D. and six F-16 Fighting Falcon from Misawa Air Base, Japan conducted bilateral joi...

CUTLINE Where: Misawa Air Base, Aomori, Japan When: 04 Feb 2020 Credit: Staff Sgt. Melanie A. Bulow-Gonterman/USAF/Cover Images **Editorial use only...

Joann Smith waits in line to attend a caucus night campaign rally with Democratic presidential candidate former Vice President Joe Biden on Monday, Fe...

Natalie Serrano, left, and Isaac Garcia watch caucus returns come in with their son Leonel, 2, at a Democratic presidential candidate Sen. Bernie Sand...

A photo shows a thermometer for checking spectator's body temperature during Four Continents Figure Skating Championships at Mokdong Ice Rink in Seoul...

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., with his wife Jane O'Meara Sanders, speaks to supporters at a caucus night campaign rall...

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., arrives to speak to supporters at a caucus night campaign rally in Des Moines, Iowa, Mon...

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks to supporters at a caucus night campaign rally, Monday, Feb. 3, 2020, in Des...

Democratic presidential candidate Sen. Amy Klobuchar, D-Minn., speaks to supporters at her caucus night campaign rally in Des Moines, Iowa, Monday, Fe...

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., acknowledges the cheering crowd as she stands on stage with her grandson Atticus Man...

Democratic presidential candidate former Vice President Joe Biden speaks with Jill Biden at a caucus night campaign rally on Monday, Feb. 3, 2020, in...

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., with his wife Jane O'Meara Sanders, right, and other family members, speaks at a caucus...

Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg speaks to supporters at a caucus night rally in Des Moines, Iowa, Mond...

Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg speaks to supporters at a caucus night rally in Des Moines, Iowa, Mond...

Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg arrives to speak to supporters at a caucus night campaign rally, Monda...

Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg takes a selfie with supporters after speaking at a caucus night campai...

Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg speaks to supporters at a caucus night campaign rally, Monday, Feb. 3,...

Caucus goers seated in the section for Democratic presidential candidate former Vice President Joe Biden hold up their first votes as they are counted...

Democratic presidential candidate Sen. Amy Klobuchar, D-Minn., greets supporters at her caucus night campaign rally in Des Moines, Iowa, Monday, Feb....

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks at a caucus night rally the Forte Banquet and Conference Center, Monday, Feb....

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks at a caucus night rally the Forte Banquet and Conference Center, Monday, Feb....

Democratic presidential candidate former Vice President Joe Biden with Jill Biden at a caucus night campaign rally on Monday, Feb. 3, 2020, in Des Moi...

People wearing a mask arrive at the Beijing Station on February 4, 2020. The number of the patients who have been infected with a new coronavirus has...

Donna Rotunno, Harvey Weinstein's attorney, arrives arrives at court for his rape trial, in New York, Tuesday, Feb. 4, 2020. (AP Photo/Richard Drew)

Precinct captain Carl Voss of Des Moines displays the Iowa Democratic Party caucus reporting app on his phone outside of the Iowa Democratic Party hea...

Supporters of Democratic presidential candidate former Vice President Joe Biden surround a heckler, center, during a campaign rally, Tuesday, Feb. 4,...

Iowa Democratic Party chairman Troy Price walks off stage after speaking about the delay in Iowa caucus results, Tuesday, Feb. 4, 2020, in Des Moines,...

Iowa Democratic Party chairman Troy Price speaks about the delay in Iowa caucus results, Tuesday, Feb. 4, 2020, in Des Moines, Iowa. (AP Photo/Charlie...

Amanda Mrakovich holds her sleeping daughter Eva before the start of a campaign rally for Democratic presidential candidate Sen. Bernie Sanders, I-Vt....

President Donald Trump greets Supreme Court Chief Justice John Roberts as he arrives to deliver his State of the Union address to a joint session of C...

Kweisi Mfume, second from left, Democratic nominee for Maryland's 7th Congressional District, speaks at a victory party with his wife, Tiffany, left,...

Kweisi Mfume, Democratic nominee for Maryland's 7th Congressional District, raises his fist at a victory party, Tuesday, Feb. 4, 2020, in Baltimore. (...

David Steinrueck and Kelly Wilkins embrace as they wait on caucus results at a Democratic presidential candidate Sen. Bernie Sanders, I-Vt., caucus ni...

People wait for results at a caucus night campaign rally for democratic presidential candidate former Vice President Joe Biden on Monday, Feb. 3, 2020...

Anne Montgomery smiles as she listens to her son Democratic presidential candidate former South Bend, Ind., Mayor Pete Buttigieg speak to supporters a...