Seems to me the real question is what skeltons does Rick harbor that could be used in an attack ad. Losing by nearly 20 points in a swing state doesn't look good, but it's a little too astute of a point for a tv ad. The man was in Congress for a long time. Surely he has some votes that can be miscontrued.
Santorum tipped off John Ensign about his scandal at one point, but I honestly don't think that that's, relatively speaking,
that bad, since if I was in a situation where I had a close friend who was in deep sh**t I'd probably feel some conflicting moral imperatives too.