Joe Biden won Michigan's crucial Democratic nominating contest on Tuesday, taking a big step toward the party's presidential nomination and dealing a stinging blow to rival Bernie Sanders' fading White House bid.

Biden, the former U.S. vice president under Barack Obama, also captured Missouri and Mississippi on a day when six states made their choices in the race to pick a challenger to Republican President Donald Trump.

The wins on Tuesday put Biden, 77, on a path to the nomination to face Trump in the Nov. 3 election while effectively closing the path for Sanders, 78, who had been hoping for an upset win in Michigan.