Beto O'Rourke became the third former Democratic primary candidate to join Joe Biden in his race for the White House on Monday. This new support is welcome for the former vice-president, as the decisive day of "Super Tuesday" looms, during which fourteen states vote.

"I'm going to vote for Joe Biden," Texan Beto O'Rourke announced Monday at a former vice president's public meeting in Dallas. This support comes soon after Senator Amy Klobuchar and former mayor Pete Buttigieg also rallied Joe Biden in his race for the White House. Faced with the favorite Bernie Sanders, the former right-hand man of Obama thus appears reinforced, Tuesday, for "Super Tuesday", decisive stage of the democratic primaries in the United States.

>> READ ALSO - Democratic primaries: Joe Biden wins South Carolina

All hope that their withdrawals will allow Joe Biden to present himself as a bulwark to Bernie Sanders. The ideas left on the left of the senator from Vermont, who advocates in particular universal medical coverage, worry a part of the Democratic establishment.

A third of the delegates

This "super" electoral day, during which fourteen states are invited to vote to choose Donald Trump's rival in November, also marks the entry into the running of a new protagonist: the billionaire Michael Bloomberg, who had renounced the first four ballots due to late candidacy.

California, a progressive state with 40 million inhabitants, will weigh decisively on this day. Texas, with its 30 million inhabitants, will be the other heavyweight to watch. Even more than the number of voters, it is especially the fact that more than a third of the delegates will be distributed at once which makes this day a key moment in the American electoral calendar.