Vermont Sen. Bernie Sanders banged his gavel and threw his arms in the air as Oklahoma Sen. Markwayne Mullin, a Republican, invited International Brotherhood of Teamsters President Sean O'Brien to fight during a Senate committee hearing three weeks ago.

“Hold it! Stop it! No, no, sit down! You’re a United States senator,” Sanders yelled, later adding: “This is a hearing and God knows the American people have enough contempt for Congress. Let’s not make it worse."

It’s a look that stays true to the Vermont independent's image among Americans − an animated, progressive firebrand with a strong appeal to young voters − the kind of voters who recent polling indicates may not be as interested in backing President Joe Biden as they were in 2020. One November NBC News poll found Biden's approval rating among 18-34 year olds dropped to 31% from 46% two months prior.

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