Elizabeth Warren flexes progressive power with Working Families Party endorsement

New York (CNN)The Working Families Party, a liberal organization founded in New York, endorsed Sen. Elizabeth Warren for president on Monday, offering a fresh glimpse into an emerging primary season divide on the progressive left.

Warren won the WFP's support through an online vote, earning nearly 61% support from a combination of the party's members, supporters and national committee. Sen. Bernie Sanders, who was endorsed by the WFP ahead of the 2016 primary with 87% of the vote, scored only 35.8% this time around.