Voters in Iowa cast the first ballots of the 2016 presidential election in caucuses across the state on Monday, US time. Polls show a close race in both Democratic and Republican contests. Hillary Clinton is leading Bernie Sanders by around 3 percentage points, and Donald Trump is ahead of Ted Cruz by a more comfortable 8-point margin. Marco Rubio holds a strong third place in the Republican race at around 15 percent. Here's a guide to understanding the results. Watch the Turnout Polling, of course, is not perfect. It's more challenging in primaries than in general elections, because there are far more undecided voters and turnout is more unpredictable. It's even harder in an early caucus;...
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