It's not just about 9/11:

...Meanwhile, writers on the left express disbelief at the notion that a pro-choice Republican candidate might be able to win the GOP nomination. According to the best Leftist analyst of American politics, Michael Tomasky, abortion is simply "too fundamental an issue for most Republican caucus goers and primary voters (even in California, with its likely Feb. 5 primary) to work around."

There's a perfectly simple answer to the Rudy paradox. When Republican voters look at Rudy Giuliani, they know one key fact about him: They know he's no liberal.

They may not exactly know why yet, but they know it.

And they want to find a reason to vote for him, which is just about opposite from the way most feel about John McCain.