Coakley didn't lose because Obama campaigned a little for her. She lost because she was a terrible candidate and Brown was a great candidate... and because it was a special election. I don't see how this would do anything but help Patrick a tiny bit.
Maybe it was a coincidence that Corzine, Deeds, and Coakley all saw their numbers dive in polls immediately after an Obama visit. Maybe.
Corzine lost because he was extremely unpopular (I could just as easily say that Christie's margin of victory would've been slightly greater if Obama never campaigned for Corzine), Deeds was always going to lose by a large margin, and Coakley lost because she was a crappy candidate and Scott Brown was an excellent one. BTW, Coakley's numbers went into free-fall well before Obama came to campaign for her (otherwise, he wouldn't have been taking time to campaign for her in the first place).
