Romney would've helped McCain but wouldn't have put him over the top. Also, I don't see them getting along enough to be on the ticket together.
Heh, no. Palin was an asset, propelling McCain from being down by 15 points in July to up by 5 in September. Alabama (and alaska for that matter) was a swing state. Still only lost by 7, and that's after a few nasty interviews. All in all, watch Game Change.
I remember McCain being even with Obama and Clinton until Obama had clinched the nomination in late June. After that he was 3-5 points ahead of McCain until he picked Palin which gave McCain a 4-6 point lead until the housing market collapse. All in all, I don't really think that many people pay attention to the VP nominee and wouldn't put it as even being a top 25 issue. Still, I think Romney would've helped just enough to make it a 51-48 race or so.