While he’s still got a primary to win against a crowded Democratic field, Sen. Bernie Sanders took the fight to President Donald Trump on Friday before more 4,500 supporters gathered at Springfield’s MassMutual Center.

Sanders told the raucous crowd his campaign’s movement “by, of and for the working people” would win Sen. Elizabeth Warren’s home state of Massachusetts and eventually the Democratic nomination. The Vermont progressive described Trump as a “pathological liar" and “fraud” running “the most corrupt administration in modern U.S. history.”

“Donald Trump apparently never read the Constitution,” Sanders said. “Every day, with his attacks on the media, attacks on the judiciary, attacks on Congress ... he has undermined American democracy, moving this country toward an autocracy. This is a democracy. We’re proud of our democracy. We’re not going to have an autocracy.”

The American people, he argued, “are sick and tired of a government that works for the rich and ignores everybody else. This is not just a campaign. It is a movement that says to the corporate elite: ‘you cannot have it all. We’re coming back.'”

Sanders seized on reports that Democratic leaders and several industries were fearful of his nomination.

“The political establishment are getting really nervous,” he said.

The “military industrial complex,” Wall Street, insurance and drug companies and “the fossil fuel industry that’s destroying this planet” were all “right to get nervous," Sanders added. "We’re going after them.”

Sanders said the common refrain from Democratic party leaders was that “Bernie can’t beat Trump.”

But he urged them to “look at the last 60 national polls ... 56 out of 60 times, we beat Trump." He also touted polls showing him besting Trump in battleground states like Michigan, Pennsylvania and Wisconsin.

“They’re not worried that we can’t beat Trump,” he said, “they’re worried we will beat Trump.”

Sanders’ Springfield rally comes as the campaign swings through the Bay State ahead of Super Tuesday, with a four-day music and canvassing festival, BERNIEPALOOZA, in Worcester, and another rally planned in Boston on Saturday.