It's been a busy year on the 2016 campaign trail, with plenty of surprising moments to keep people guessing.
Some candidates that were expected to be formidable frontrunners have seen themselves challenged or toppled. Other candidates that many people wrote off as sideshows have moved to center stage, challenging traditional assumptions about the mechanics of American politics.
As 2015 draws to a close, and just a few weeks before voting begins in early primary and caucus states, it seems like an appropriate moment to take stock of the standout moments of the election thus far - from the fireworks at debates to the heated rhetoric on the campaign trail.
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