San Francisco Mayor Gavin Newsom, seen here clowning around with a microphone last year, will host a one-hour Saturday radio show for Air America starting in two weeks, the Examiner reports. (Actually Matier & Ross broke the story April 7, but the Ex now has the date he starts.) The liberal Air America network has 60 stations including Clear Channel’s “Green 960” KKGN-AM San Francisco and KSAC-AM 1240 Sacramento. Newsom’s show will air from noon to 1 Pacific.

“It’s an opportunity to have a more substantive dialogue on policy than a lot of the tit-for-tat at City Hall,” Newsom said. “I’m trying to focus on something much bigger than who’s up and who’s down at City Hall.” It’s widely assumed that Newsom will run for governor in 2010.