Candidates for governor of Kentucky: Democrat Jack Conway (from left), independent Drew Curtis and Republican Matt Bevin. Timothy D. Easley/AP hide caption
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Crews prepare the venue for the CNBC Republican presidential debate inside the Coors Events Center at the University of Colorado. Brennan Linsley/AP hide caption
Gas stations across Iowa, like this Casey's General Store in Des Moines, boast ethanol as "cleaner air for Iowa." Clay Masters/Iowa Public Radio hide caption
Democratic mayoral candidate Jim Kenney benefited from a super PAC that helped him win in the city's Democratic primary election. Matt Slocum/AP hide caption
Carly Fiorina speaks to reporters after voting in the June 2010 Republican primary. She went on to lose her bid for Senate to Barbara Boxer. Getty Images hide caption
'Fierce Determination' Fueled Fiorina In 2010 Bid, As It Does Now
Capital Public Radio
Ex-Iowa State Sen. Kent Sorenson defected from Michele Bachmann's campaign before the 2012 Iowa caucuses. In a 2014 plea deal, he admitted that he lied about payments from the Ron Paul campaign. Charles Dharapak/AP hide caption
Donald Trump owns this Trump Tower building at 725 Fifth Ave. in New York City. It's one of only a handful he owns in the city, though 17 buildings there bear his name. Spencer Platt/Getty Images hide caption
When You See 'Trump' On A Building, It Might Not Be What You Think
Sen. Bernie Sanders in his office in 1981, shortly after becoming mayor of Burlington, Vt. He once said his tenure as a socialist mayor is evidence people are willing to accept radical change. Donna Light/AP hide caption
Gov. Bill Clinton shakes hands with the crowd as he arrives at a rally being held for him in Hartford, Conn., in March 1992. Jim Cole/AP hide caption
Lindsey Graham (left) and Bob Schroeder at Robie's Country Store in Hooksett, N.H. Brady Carlson /New Hampshire Public Radio hide caption
Republican presidential candidate Rand Paul wants to run for both his Kentucky Senate seat and the White House, but a current state law prohibits him from doing so. Charles Krupa/AP hide caption
Pizza Ranch touts its pizza and chicken options, seen here at the Fort Dodge location that opened last year. The company's vision statement is "to glorify God by positively impacting the world." Clay Masters/Iowa Public Radio hide caption
Dan Tothill, 26, and Megan Brabec, 24, are struggling with high student debt burdens and underemployment. "I hope that I can look back on myself in 10 years, like 'Oh, I was so silly to be worrying about that," Tothill said. "But, at this point, it doesn't feel that way at all." Jesse Costa/WBUR hide caption
Sen. Bernie Sanders' household took in more than $205,000 in 2014, and paid the feds nearly $28,000 in taxes. Drew Angerer/Getty Images hide caption
Candidate Limberbutt McCubbins is not the first non-human to become a presidential candidate. Others include a pig named Pigasus the Immortal in 1968 and Molly the Dog in 2008. Courtesy Emilee McCubbins hide caption
For Limberbutt McCubbins, 'The Time Is Meow' To Run For President
Louisville Public Media
Gov. Chris Christie, R-N.J., will announce Tuesday that he is running for president. Matt Rourke/AP hide caption
Hillary Clinton, then senator, waves to the crowd during the Puerto Rican Day Parade in New York City in 2004. Stephen Chernin/Getty Images hide caption
Wisconsin Gov. Scott Walker talks with Sen. Joni Ernst, R-Iowa, before Ernst's Republican fundraising ride Saturday. Charlie Neibergall/AP hide caption
As candidates, staff and media flood Iowa, there will inevitably be photo ops with grain silos and bales of hay. Justin Sullivan/Getty Images hide caption
Democratic presidential hopeful Hillary Clinton speaks with Frederic Hunt, a minister at First Calvary Baptist Church, during a campaign stop Wednesday at The Main Street Bakery in Columbia, S.C. Richard Shiro/AP hide caption
Republican presidential hopeful Sen. Ted Cruz speaks at the Republican Leadership Summit Saturday in Nashua, N.H. Jim Cole/AP hide caption
New Jersey Gov. Chris Christie addresses a Jan. 16 gathering of homeowners in Manahawkin, N.J., who were affected by last year's Superstorm Sandy. Mel Evans/AP hide caption