OK, tell me the last far-left pubbie who won the presidency, then.
George Bush Sr. in 1988.
In your world view, probably Eisenhower and at least Bush pere were "lefties." But you know, the nation changes, each candidate is unique as a person, the issues are different in each election cycle, and there are really too few data points, to rely on any such historical analysis. So we are left with looking for polls where the Rudy is beyond the pale for some Pubbies, and they won't vote for him in a matchup with Hilary or Edwards or Obama after being informed of his "heretical" views, and an assessment of the candidate's abilities as to presentation. I think Rudy's presentation is excellent, but hey, the season is young, and he has to run a lot of laps. Nothing is in stone.