Americans eager to know which Democrat will face President Donald Trump in November's election may have a clearer view after "Super Tuesday" - sure to be a defining moment in the race.
Four of the country's 50 states have already voted, but March 3 is the biggest day of the entire presidential primary process, with tens of millions of Americans eligible to cast ballots.
It could be a turning point when frontrunner Bernie Sanders secures an insurmountable lead - or former vice president Joe Biden secures a dramatic comeback. Success on Super Tuesday requires a tremendous ground game, top-notch fundraising and serious momentum.
Elizabeth Warren and Amy Klobuchar will likely have to face a daunting choice Wednesday morning: defy the odds and keep going, or bow out.
Here are a few things to watch for on Super Tuesday:
Fourteen battlegrounds
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