Every time Jonah Goldberg runs Donald Trump down (as he does here), he increases the probability, even if only incrementally, that Hillary Clinton will become our 45th president. Either he doesn't grasp this, in which case he's stupid (because it's obvious to anyone who has a brain), or he grasps it but doesn't care, in which case he can't claim to be a conservative (or even someone who cares about his country).
I've said it before, but Goldberg is engaged in self-indulgent moral preening (a.k.a. virtue signaling). He and his fellow conservative purists, such as George Will, William Kristol, Stephen Hayes, and Erick Erickson, didn't get their way this time, so, instead of doing what they advised others to do when John McCain and Mitt Romney were the Republican nominees, which is to hold their noses and vote, they've decided to undermine the nominee.
Leave aside the fact that this is a perfect example of not playing fair; it's also self-defeating. If Goldberg truly loves his country, as I'm sure he would say he does, and if he would like to reverse the course Barack Obama has set the country on, as I know he does, he should support Donald Trump, for Trump is the only way to stop Hillary Clinton, who will continue (and in all likelihood ramp up) Obama's pernicious policies. If Hillary Clinton is elected president, it will be because pundits such as Goldberg put themselves (i.e., their moral purity) before their country, and that is disgraceful.
