This was said by Zizka in one of Max Sawicky's comment threads about Jane Galt, but it could just as easily apply to any number of online right-wingers, including good ol' Instapundit:

I get the impression that she's a non-Democrat first and a libertarian second, and that nothing whatever could bring her over. At any given time she'll choose the most plausible possible reason for opposing the Democrats, shifting positions as necessary as the Republican position deteriorates, while always hanging on to some figleaf of libertarian independence.

I honestly can't think of anything I have to add to that.