Sen. Bernie Sanders (I-Vt.) won Alaska's Democratic caucus on Saturday, defeating former Secretary of State Hillary Clinton by a wide margin.

Alaska will send 20 delegates to the Democratic convention, 16 of whom will be chosen based on the results of Saturday's caucuses. (The remaining four are superdelegates who are not bound to any candidate.) Sanders' wife Jane traveled to Anchorage on Thursday to campaign for her husband.

Speaking at a rally in Madison, Wisconsin, thanked Alaskans for handing him a "resounding" victory. "Our campaign has the momentum," Sanders said. "We have a path toward victory."

Sanders won the Democratic caucuses in Utah and Idaho on Tuesday. He entered the weekend poised to do well in Hawaii and Washington state, which also hold Democratic caucuses on Saturday. He also picked up a major West Coast union endorsement Thursday.

Despite those victories, Sanders still trails Clinton by almost 300 pledged delegates and faces an uphill battle to earning the Democratic nomination.

Sanders has said he will stay in the race until the Democratic convention in late July. As Politico reported earlier this week, Sanders' problem hasn't been winning, but winning in states with large amounts of delegates by relatively small margins, which has hurt him because Democrats award delegates proportionally.