To the libertarians (with a small l), as did other non-Jewish GOP members. Buchannan did as much as Perot to defeat Bush and give us Clinton.
That's answer is a non sequitur. Small-l libertarians are not a political party. It's like saying that somebody left the U.S., and when asked where he went, you say, "to the movies".
Once again, what political party(-ies) did they go to after leaving the GOP? And keep in mind that you yourself just got through saying that many Republicans are just unreconstructed Democrats.