Michel Richard (Allison Dinner for The Washington Post)

Martin O’Malley rockin’ out at the Saw Doctors concert at the Fillmore Thursday night. Low-profile in a ballcap and untucked button-down. The Maryland governor has been known to join his favorite Irish band onstage but did not this time; the band, though, did give a shout-out to his signing of the state’s gay-marriage bill earlier in the day.