Joe Biden hailed Super Tuesday as a "good night" that was getting "even better" as he secured early wins over Bernie Sanders in the race to win the Democratic presidential nomination.

"It's a good night and it seems to be getting even better! They don't call it Super Tuesday for nothing," he told cheering fans in Los Angeles.

The former vice president built a lead as 14 states voted to pick the Democratic challenger to President Donald Trump, with seven projected wins against three for Sanders.

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