According to Bernie.
I don't have peripherals, but he was .235/.327/.382 against lefties in 2008, and he's 35.
Not quite a shut down lefty, but depending on the contract, this could be a pretty smart pick up. LOOGY's seem to be in high demand this offseason, and Mo went out and made sure to snag a serviceable one. Again, no contract details yet, but he's certainly going to be cheaper than Affeldt, so the Birds could/should still be in the game for Rhodes/Ohman/Cruz/someone better than Miller.
He is a type B FA though, so the Rays get a pick, which I'm sure they'll use to draft some elite player who will be better than whoever we would have drafted with the pick.