See McCain/Romney would have been 51-48 or 51-49. That's still not good enough to win though. However, Palin still helped the ticket. McCain vs Obama without VP's would've been a 10 point race. In 2012 if Romney runs I think that Jeb Bush would suit him well and so would someone like John Thune or Eric Cantor even though they don't know each other.
Its so funny that Palin helped McCain in the polls, but then when the shat hit the fan with wall street, voters decided Obama/Biden was more competent to handle the issue.
People realized that Palin was unexperienced and that McCain was too old. The Republicans need some real Adults on the ticket and they will have a fighting chance.