Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) is joined onstage by her husband Bruce and their dog Bailey at a Get Out the Caucus Rally in Cedar Rapids, Iowa, U.S., February 1, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren's dog Bailey attends a rally with supporters in Des Moines, Iowa, U.S., January 31, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA), her husband Bruce and their dog Bailey leave their house to vote on Super Tuesday in Cambridge, Massachusetts, U.S., March 3, 2020. REUTERS/Brian Snyder 

A supporter of Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren pets her dog Bailey, after Senator Warren could not attend a campaign event due the ongoing impeachment trial of U.S. President Donald Trump, in Carroll, Iowa, U.S., January 30, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA), with her husband Bruce and their dog Bailey, greets resident Lucien Trudeau (R) while campaigning door-to-door in Manchester, New Hampshire, U.S., February 8, 2020. REUTERS/Brian Snyder 

An attendee leaves a campaign town hall event held by U.S. Democratic presidential candidate Senator Elizabeth Warren near a large inflatable version of Warren’s dog, Bailey, at the Clark County Government Center Amphitheater in Las Vegas, Nevada, U.S. February 21, 2020. REUTERS/David Ryder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA), her husband Bruce and their dog Bailey arrive for a campaign town hall meeting at Dartmouth College in Hanover, New Hampshire, U.S., October 24, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) pets her dog Bailey at a campaign canvass kickoff at the home of a supporter in Urbandale, Iowa, U.S., February 1, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) is joined onstage by her husband Bruce and their dog Bailey at a Get Out the Caucus Rally in Cedar Rapids, Iowa, U.S., February 1, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA), accompanied by her husband Bruce and their dog Bailey, campaigns door-door with volunteer Colin Pio (C) in Manchester, New Hampshire, U.S., February 8, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) waits to take the stage with her husband Bruce and their dog Bailey at a campaign stop in Exeter, New Hampshire, U.S., March 15, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren's dog Bailey is seen outside the Democratic presidential debate at Saint Anselm College in Manchester, New Hampshire, U.S., February 7, 2020. REUTERS/Eric Thayer 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren’s husband Bruce, with their dog Bailey, speaks to supporters, after Senator Warren could not attend a campaign event due the ongoing impeachment trial of U.S. President Donald Trump, in Carroll, Iowa, U.S., January 30, 2020. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) pets her dog Bailey after a campaign event in Cedar Rapids, Iowa, U.S., February 1, 2020. REUTERS/Rick Wilking 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) is joined by her dog Bailey while speaking to New Hampshire Young Democrats in Nashua, New Hampshire, U.S., February 23, 2019. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) is joined onstage by her husband Bruce and their dog Bailey at a rally to launch her campaign for the 2020 Democratic presidential nomination in Lawrence, Massachusetts, U.S., February 9, 2019. REUTERS/Brian Snyder 

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) is joined by her dog Bailey at a campaign town hall meeting at Dartmouth College in Hanover, New Hampshire, U.S., October 24, 2019. REUTERS/Brian Snyder 

Potential 2020 Democratic presidential candidate U.S. Senator Elizabeth Warren (D-MA) is joined onstage by her husband Bruce and their dog Bailey at an Organizing Event in Manchester, New Hampshire, U.S., January 12, 2019. REUTERS/Brian Snyder