Bernie Sanders gets game-changing endorsement

The Democratic presidential candidate is having a stellar week.

One of America's biggest progressive groups, MoveOn, has endorsed Vermont Sen. Bernie Sanders for president—a major win for the socialist Democrat's campaign.

The group, which has more than 8 million members, announced on Tuesday that more than 78 percent of its members voted in favor of a Sanders endorsement, the largest margin of victory for any candidate in MoveOn's history. In comparison, former secretary of state Hillary Clinton received only 14.6 percent of member votes.

BREAKING: #MoveOn members back @BernieSanders in the #2016 presidential race! #FeelTheBern pic.twitter.com/aT8id1i502

— MoveOn (@MoveOn) January 12, 2016

The progressive group said in a blog post that members cited five reasons for the endorsement:

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Sanders' campaign responded to the endorsement on Twitter, welcoming MoveOn to "the political revolution."

Proud to have the millions of @MoveOn members join our people-powered campaign. Welcome to the political revolution. pic.twitter.com/t52wjQ5eH4

— Bernie Sanders (@BernieSanders) January 12, 2016

Not only did Sanders score this huge endorsement just weeks before the Iowa caucuses, but the Democratic candidate also got a shout-out from U.S. Vice-President Joe Biden on Monday night.

During a CNN interview, Biden praised Sanders for his long-term commitment to economic equality, saying, "Bernie is speaking to a yearning that is deep and real. And he has credibility on it."

In the same stroke, Biden called Clinton "relatively new" to the fight against wealth disparity.

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So far, Sanders' campaign has had a stellar week.

Sanders overtook Clinton in an Iowa poll on Tuesday. The two candidates are extremely close in the polls: Clinton has 43 percent of Democratic voters' support and Sanders has 39 percent, according to a recent poll from Investors Business Daily.

With the Iowa caucuses just around the corner, it's likely that more big endorsements will be coming in for both Sanders and Clinton. In a race this close, every victory counts.

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