The 2016 U.S. presidential race formally began Monday in the mid-western state of Iowa, as Iowans were gathering in some 1,681 precincts to make their choices among the candidates in the state's caucuses.
Three candidates, including former Secretary of State Hillary Clinton, are competing to be the standard-bearer of the Democratic Party, while the Republican field includes New York billionaire developer Donald Trump, former Florida Governor Jeb Bush, and nine other candidates.
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