Sanders Vows Contested Convention, Makes Case for Superdelegate Flips

The Vermont senator continued to argue that he could still win the Democratic nomination.

Bernie Sanders Makes His Case to Superdelegates

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Bernie Sanders on Sunday marked the one-year anniversary of his bid for the White House by vowing that the Democratic convention will be "contested," despite Hillary Clinton's wide lead in pledged and overall delegates.

"It's virtually impossible for Secretary Clinton to reach the majority of convention delegates by June 14 with pledged delegates alone," the Vermont senator told reporters at the National Press Club in Washington.