If Ron Paul was nominated, he would be, by definition, electable.
Ignoring that, I am sure you are right in that he cannot win if nominated. The regular Republicans would drop dead and not vote. Anti-war Democrats would, ignoring Ron Paul anti-war stance in comparison to Obama, rush to vote for Obama in record breaking numbers. No Libertarians would show up, independents (who he has been shown to be leading with or at least almost leading with in several polls) would disappear, the Tea Party would dissipate, and he would lose every state. Oh, and the polls that stick him somewhere between 1-10% behind Obama as of now (while Obama is pretty much at peak performance)? Ignore them, Ron Paul is UNELECTABLE.
Oh, and Walter Jones would be a pretty good VP for Ron Paul; close enough in views so as to not be divisive (or, if Ron died in office, to want to roll back whatever he does), but different enough so as to broaden his appeal.