Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE, hoping to usher in a new wave of progressive lawmakers, stumped for a little-known House candidate vying to take the seat back from Republicans.

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Sanders appeared with Eric Kingson, a 70-year-old college professor, at a campaign event in Syracuse, N.Y., Saturday. Kingson is running in New York's 24th Congressional District to unseat Republican John Katko.

He faces two primary challengers in Tuesday's election — Colleen Deacon, a former aide to Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE, and lawyer Steven Williams. Deacon has the support of the Democratic Congressional Campaign Committee (DCCC).

The event drew about 500 people, the Washington Post reported. Kingson delivered a 10-minute speech and was followed by a 25-minute address from Sanders in which he mixed his own campaign speech with praise of Kingson.

"So let's give 'em a heart attack on Tuesday, and show up to vote!" Sanders said of overcoming the Democratic establishment.

Since Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE became the party's presumptive nominee, Sanders has been promising supporters to continue his "political revolution" and endorsing progressive down-ballot candidates.

In an email announcing his endorsement of Kingson in early June, Sanders said he "led the fight to protect Social Security" and asked for donations that would be split between the campaigns.