In the US, super Tuesday spells a big day for both the Democrats and the Republicans in the race to the White House.

The first exit polls from the Super Tuesday show former Vice President Joe Biden making the most gains in a face-off with Senator Bernie Sanders.

Bernie Sanders looks to take charge on Super Tuesday, Joe Biden hopes to catch up with him.

Former US rivals Pete Buttigieg and Amy Klobuchar endorse Joe Biden's presidential candidacy on the eve of Super Tuesday voting, as moderate Democrats rallied around the former vice president to strengthen his challenge to front-runner Bernie Sanders.

US Democratic presidential candidate Elizabeth Warren says Mike Bloomberg is an "egomaniac billionaire."

People in four US states including Michigan have cast their ballots in primary and caucus elections to choose Republican and Democratic nominees for the 2016 presidential race.

US presidential candidates Donald Trump and Hillary Clinton have both scored big on Super Tuesday, when eleven states held presidential primaries and caucuses.