By Stephen M. Silverman
Updated September 04, 2002 11:00 AM

Ben Affleck has apparently left Jennifer Lopez’s side long enough to join his old companion, Matt Damon, for a bit of old-fashioned politicking.

The Associated Press reports that the two longtime collaborators (“Good Will Hunting”) are helping high school friend Marjorie Decker, 30, a Democratic city councilor from Cambridge, Mass., as she campaigns in a Sept. 17 election for state representative. (Affleck and Decker were classmates at Cambridge’s Rindge and Latin School, while Damon was one year ahead of them.)

To help out with the campaign, Damon, 31, has taped a phone message that will go out to voters starting Wednesday, urging voters to support his candidate. Meanwhile, Affleck, 30, appears in Decker’s campaign literature, sharing memories about the Little League team they played on together.

“Until now, I never admitted she was a better hitter than I was,” Affleck says in the mailing.

Decker, a two-term councilor, is challenging incumbent Democratic Rep. Paul Demakis in a district that includes parts of Boston and Cambridge. There is no Republican candidate on the preliminary ballot.