Iowa's first-in-the-nation caucuses kick off the U.S. primary election season Monday, Feb. 1, 2016.
Iowa Set To Kick Off US Primary Election Process

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Looking west from the Iowa State Capitol steps shows a view of downtown Des Moines. Iowa's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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Visitors on boats enjoy Someiyoshino cherry blossoms at Chitorigafuchi Imperial Palace moat in Tokyo.

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Joe Enriquez Henry with the League of United Latin American Citizens goes door-to-door to urge people to vote in Des Moines, Iowa. Iowa's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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The League of United Latin American Citizens, one of the oldest and largest Latino organizations in the United States, urges immigrants in the community to vote, in Des Moines, Iowa.

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Students volunteer for Jeb Bush at Drake University in Des Moines, Iowa, Jan. 27, 2016. Iowa's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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Westhenry Ioerger is a supporter and campaign volunteer for Republican presidential candidate Ted Cruz, in Des Moines, Iowa. The stae's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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Alec Bognar, a supporter of Republican presidential candidate Donald Trump, poses at a rally in Des Moines, Iowa, Jan. 28, 2016.

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Jonathan Rudnick is a supporter of Democratic presidential candidate Hillary Clinton, in Des Moines, Iowa. Iowa's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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Student supporters for Democratic presidential candidate Martin O'Malley rally in Des Moines, Iowa. The state's first-in-the-nation caucuses kick off the U.S. primary election season Monday.

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Megan Marsh is a supporter for Democratic presidential candidate Bernie Sanders, in Des Moines, Iowa. The state's first-in-the-nation caucuses kick off the U.S. primary election season Monday.