Who is running for President in 2016 elections?

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In America, the race to succeed Barack Obama as president of the United States is about to get interesting.

Primary season where each party picks their candidate for the general election is almost upon us.

This election is full of bold characters, bitter rivalries and the results are far from sewn up.

So before the Iowa becomes first state to decide on a candidate on February 1st, here's a reminder of how the US elections work, who's running for the top job, and which candidates you should keep an eye on as the campaigns progress.