He’s obviously not a Republican or he would commit to support the GOP nominee. Why should the other candidates commit to support him if he wins given that he’s not willing to commit to them? What is the purpose of a political party if the candidates aren’t willing to abide by the judgment of the members?
Look at the countless "republicans" who are mumbling against Trump--will they "support the nominee" if he is it? I don't think so. Much of the party fifty years ago sabotaged Goldwater, "the party's nominee." Party "republicans" are jackass hypocrites to be getting all sanctimonious about Trump.
(Waves hand wildly..."I know, I know!")
Because they won't support him and are already trying to backstab him?