David Boaz points out that he isn't one. Matt points out that this calls into question the Boaz thesis that there's a large "libertarian vote" out there waiting to be claimed. Rather, Matt writes, "there's a medium-sized constituency for lower taxes plus less government regulation of sex," which is basically what Rudy's selling when he isn't talking about terrorism and 9/11.
Andy Ferguson, as usual, got here first, when he pointed out that Rudy has positioned himself as the candidate of "every voter who is at once pro-choice and pro-war, pro-gay rights and pro-Patriot Act, against guns and in favor of privatizing Social Security." Whatever else this is, it shouldn't be confused with libertarianism.