All those you have not voting for him for various reasons are the same voters.
They will ve vastly outnumbered in more crucial States by those to who those are not issues worth considering.
He may not be nominated. But if he is nominated, he wins.
If neither he nor McCain are nominated, the Republican likely loses- particularly against Hillary.
I think Allen can win, perhaps with Rudy on the ticket. but's its going to be damn close - just like last time. and when the pro-lifers find out that Allen is tolerant of abortion for adult women in the first trimester, some may bolt over that anyway.
You've been reading too many 2005 polls about the 2008 presidential race. Giuliani and McCain rise to the top of those polls simply because they have more name recognition than anyone else. Neither one of those two has any chance in hell of winning the GOP nomination, and neither one would garner more than 45% of the popular vote in 2008.
At this point in 2001, Al Gore was the Democratic front-runner for 2004 -- for the same reasons.