"Yeah. Some Guy."
Actually, I don't think Any Guy is running against him, but that could change, the filing deadline is June 28th per today's NY Post.
Good post, though, you're right, you can't beat somebody with nobody and no support.
According the the RI Conservative blog Anchor Rising (which is worth bookmarking if you're local), some guy named Ed Leather, a former foreign service officer, is throwing his hat in the ring. His kickoff is on May 27, so it's not widely known.
I had a thought, though. What you want to bet if the GOP does get behind this guy, the DNC will whine about the evil, opportunistic Republicans picking on poor Patrick, kicking a mentally ill guy when he's down. Why, they never supported a GOP candidate before this, did they?