Donald Trump was declared the winner in the GOP primary race in New Hampshire, while Bernie Sanders took the Democratic race. Victor J. Blue/Bloomberg via Getty Images and Spencer Platt/Getty Images hide caption

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Republican Chris Christie of New Jersey has invested nearly his entire campaign on New Hampshire. A poor result will almost certainly effectively end his candidacy. Robert F. Bukaty/AP hide caption

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Sen. Marco Rubio, R-Fla., answers a question during the eighth Republican presidential primary debate hosted by ABC News at St. Anselm College on Saturday. David Goldman/AP hide caption

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Theodore Roosevelt is one of the earliest presidents associated with "progressive" politics, even accepting the nomination of the Progressive Party in 1912. Topical Press Agency/Getty Images hide caption

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Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders, I-Vt., stand next to each before their debate in Durham, N.H. The debate was sponsored by MSNBC. Joe Raedle/Getty Images hide caption

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Donald Trump (right) brings the two most recent Iowa winners, Mike Huckabee (left) and Rick Santorum, on stage during Trump's rally for veterans, an event he held instead of attending the GOP debate. Christopher Furlong/Getty Images hide caption

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Republican presidential candidate Jeb Bush is seen on a TV screen as he participates in Thursday's debate in Des Moines, Iowa. Scott Olson/Getty Images hide caption

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Former Maryland Gov. Martin O'Malley, Sen. Bernie Sanders, I-Vt. and Hillary Clinton at the NBC News-YouTube Democratic presidential debate at the Gaillard Center on Sunday in Charleston, S.C. Stephen B. Morton/AP hide caption

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President Obama said he regrets that the rancor between the parties has grown during his watch. "I guarantee I'll keep trying to be better so long as I hold this office," he said. Susan Walsh/AP hide caption

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