How’s this for irony: Jesse Eisenberg, who has a penchant for playing ambitious, high-profile business tycoons, is suddenly campaigning against real-life billionaires J.B. Pritzker and Bruce Rauner in support of a “middle-class” governor candidate.

The 34-year-old actor—who most famously played the diabolical magnate Lex Luthor in Batman v Superman: Dawn of Justice and Facebook CEO Mark Zuckerberg in The Social Network—is scheduled to join Democratic gubernatorial candidate Daniel Biss and his running mate, state rep Litesa Wallace, on Saturday afternoon for a Get Out the Vote rally and march to the polls.

The rally is scheduled to start at 12:30 PM at the Bottom Lounge, 1375 W. Lake. At 1:30 PM, Biss, Wallace, and Eisenberg will lead attendees on a small march to the polling place at Union Park. It’s intended “to fire up the base and supporters,” says Biss campaign spokesperson Tom Elliott.

Why is Eisenberg getting involved in the Illinois governor’s race?

“Jesse and Daniel met a few years ago,” says Elliott. “Jesse is really interested in Daniel’s commitment to working families and social services, and he’s showed an interest in helping Daniel get his message out.”

This will be the second political rally in Chicago that Eisenberg has spoken at over the previous nine months. He was a featured speaker last June at the People’s Summit at McCormick Center—a three-day conference of about 4,000 left-wing activists and progressive political groups. Eisenberg was among a small group of celebrities who spoke on the second night of the summit after headliner Senator Bernie Sanders.

The Bloomington, Indiana, native also moonlights as a playwright and author, and wrote a list of Marxist-socialist jokes published in McSweeney’s Books of Politics and Musicals, for example:

Q. How many Marxist-Socialists does it take to screw in a lightbulb?
A. Two. One to screw in the lightbulb and one to lament Milton Friedman laissez-faire economic policies.

Earlier this week, Biss campaigned with Pussy Riot during the Chicago leg of their first-ever tour of North America. The Russian feminist punk band/protest group praised Biss as an “anti-corporate candidate and activist.”