The progressive political action committee that encouraged Elizabeth Warren to run has opted to let its supporters pick which candidate will now receive their endorsement.

In order for a candidate to win Democracy for America's endorsement, Hillary Clinton, Bernie Sanders or Martin O'Malley must secure a supermajority of at least 66.67 percent of the votes cast.

With its over 1 million members, DFA — the Howard Dean-founded, Vermont-based liberal PAC — says it helped 843 candidates with progressive values nationwide through their grassroots efforts, but this will be their first Democratic presidential primary endorsement.

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