Well that is a willful misreading of what Palin actually said. She was praising Paul for pushing that the President needed to get Congressional approval for his actions. She was not blanket endorsing Paul’s “Blame America First” nuttiness
Speaking of misreading; IMO Paul has not "blamed America first". His statement was merely that we should at least pay attention to the reasons the jihadists gave for attacking us. That does not make it "blaming America".