Caligula's horse?

Balkinization's Sandy Levinson weighs in on Gov. Palin's selection as VP:

John McCain's pick of Sarah Palin is spectacularly irresponsible. No sane person could believe that she is equipped to be President of the United States at the present time. (If Ms. Palin doubts this, then she is just another political megalomiac, who may, for all we know, believe that it is God's will that she become our President). She is minimally educated, without any significant relevant experience in thinking about or responding to the great issues of the day, and incredibly parochial, for starters. But she will be nominated, because we begin treating even our presidential candidates as the equivalent of monarchs who are free to engage in all sorts of indefensible decisions. No respectable political party would even be thinking of nominating Ms. Palin, but, of course, that is irrelevant. She is the equivalent of Caligula's horse, and if Caligula could get the nomination of a major party, then it would simply acquiesce to the horse's nomination, because that is just the prerogative of the candidate.

 Levinson's main point is to criticize the process by which VPs are chosen, but really - them's fightin' words.