Joe Biden wins Michigan, in a big blow to Bernie Sanders

MARK MAKELA / GETTY IMAGES NORTH AMERICA / AFP

Joe Biden secured commanding victories in Michigan and two other states on Tuesday, cementing his position as a frontrunner in the Democratic presidential race.

This puts the former vice president as a challenger for Republican President Donald Trump in the November 3 election.

The next big election milestone begins in a week when 577 delegates are up for grabs.

Speaking in Philadelphia, Biden thanked Sanders and his supporters for their energy and passion. "We share a common goal and together we are going to defeat Donald Trump," he added. 

"Winning means uniting America. Not sowing more division and anger."

A candidate needs the support of 1,991 delegates to secure the nomination.

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