MoveOn.org's members voted to endorse Bernie Sanders after members voted overwhelmingly for him in an online poll last week.

According to MoveOn's executive director Ilya Sheyman, 79 percent of MoveOn's members said they wanted to endorse Bernie. The vote shatters all previous records for member votes.

Sheyman listed the top reasons members gave for their choice, including Sanders' commitment to tackling economic inequality, standing for communities facing injustice, saying no to permanent war, and the belief that Sanders is the more electable candidate.

This is a huge endorsement for Bernie, and will give him access to organizing resources and mobilize grassroots support for him.

In 2008, MoveOn's members voted to endorse Barack Obama over Hillary Clinton, but by a much smaller margin. This time, the outcome wasn't even close.