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Key Nevada caucuses get under way

Sanders warns Putin: 'Stay out of US elections'

Warren's fiery performance lights up social media

Rivals pile on Bloomberg in feisty debate

Democratic rivals attack Bloomberg before TV debate

Democratic rivals attack Bloomberg in TV debate. Video, 00:01:16Democratic rivals attack Bloomberg in TV debate

Bloomberg attacked from all sides at first Democratic debate appearance. Newsday. Audio, 00:04:34Bloomberg attacked from all sides at first Democratic debate appearance

Bloomberg to join Democrat debate amid poll surge

Could it be Bernie Sanders v Donald Trump?

Top Iowa Democrat resigns over caucus chaos

Sanders' White House bid gathers pace

Winners, losers and quitters - story of the night. Video, 00:01:46Winners, losers and quitters - story of the night

Bernie Sanders wins New Hampshire primary in close race. Newsday. Audio, 00:03:38Bernie Sanders wins New Hampshire primary in close race

Bloomberg on tape: All crime is in minority areas

'My dad and I are divided over Bernie' Video, 00:03:30'My dad and I are divided over Bernie'

Buttigieg targeted by rivals in Democrat debate

Top Democrat calls for review of Iowa vote

Buttigieg and Sanders lead after Iowa vote chaos

The key issues for 2020 Democrats

Battle to beat Trump begins as Iowa votes

Could this be the start of a Bernie boom?

Democrat regrets booing Hillary Clinton at event

How Iowa is like the luge... Video, 00:02:33How Iowa is like the luge...