2012 United States presidential election

Democratic presidential contender Michael Bloomberg speaks to gun control advocates and victims of gun violence in Aurora, Colo., on Thursday, Dec. 5, 2019. The billionaire former New York City mayor unveiled a gun control policy just steps from one of Colorado's worst mass shootings, calling for a ban on all assault weapons. (AP Photo/Thomas Peipert)

Democratic presidential candidate former Massachusetts Gov. Deval Patrick campaigns Thursday, Nov. 14, 2019, at The Bridge Cafe in Manchester, N.H. (AP Photo/Charles Krupa)

FILE - In this May 7, 2017 file photo, former Massachusetts Gov. Deval Patrick arrives at the John F. Kennedy Presidential Library and Museum in Boston for the 2017 Profile in Courage award ceremony. Former Massachusetts Gov. Deval Patrick is telling allies he plans to seek the Democratic presidential nomination. That’s according to a person with knowledge of his plans who spoke to The Associated Press on condition of anonymity to discuss private conversations. (AP Photo/Steven Senne, File)

FILE - In this Dec. 15, 2014, file photo, Massachusetts Gov. Deval Patrick speaks during an interview at his Statehouse office in Boston. Former Massachusetts Gov. Patrick is considering making a late run for the Democratic presidential nomination. That is according to people with knowledge of Patrick’s deliberations. (AP Photo/Elise Amendola, File)

Democratic presidential candidate Tom Steyer speaks to reporters before hosting a town hall in Henderson, Nev., on Monday, Nov. 4, 2019. (AP Photo/Michelle L. Price)

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., greets attendees at a campaign event, Tuesday, Oct. 29, 2019, in Laconia, N.H. (AP Photo/Elise Amendola)

In this Sept. 19, 2019 file photo, Republican presidential candidate, former South Carolina Gov. Mark Sanford smiles as he talks with customers at the Puritan Backroom restaurant, during a campaign stop in Manchester, N.H. The three candidates running against Donald Trump in the Republican presidential primary aren’t likely to make major donors swoon, as fears of retribution from Trump’s orbit and an unwillingness to contribute to a losing effort are coupled with concerns about how to shape the GOP once Trump leaves the White House. (AP Photo/Elise Amendola)

White Lake resident D.J. Calma of White Lake, second from left and has worked for General Motors in four different plants in 12 years, chants in unison "No contract! No work!" as they circle at one of the Flint Assembly Plant entrance, blocking through traffic during the fourth day of the national UAW strike against GM on Thursday, Sept. 19, 2019 in Flint. The United Auto Workers union and its roughly 49,000 members at GM plants in the U.S. have been on strike since Monday, Sept. 16 because contract negotiations with the automaker had broken down. It's the first national UAW strike since 2007, when GM workers were out for two days. (Jake May/The Flint Journal via AP)

FILE - In a Wednesday, Oct. 26, 2016 file photo, then-Republican presidential candidate Donald Trump speaks in Charlotte, N.C. States are expected to begin canceling GOP presidential caucuses or primaries as part of the party’s effort to shut out the Trump primary challengers, one door at a time. (AP Photo/ Evan Vucci, File)