Has he supported non-Republicans in the past?
I am glad to hear this, actually, should be good for Rubio.
He seems to go out of his way to compliment and fawn over Democrats, but really takes the gloves off when he's slamming a Republican.
McCain on Barack Obama:
"very impressive, he's thoughtful, he's centrist"
"probably got a great future"
"a very honest and fine person"
"absolutely" qualified to be president