You are right about that. And Kristol is one of those people who can never ever admit that his opinion of someone might have changed over the years. Once he cast the President in a negative light, he could never and will never see him any other way.
Actually, that's not what Kristol does. Once in a while, he will toss the President a bone, he will seem to be on his side. I'm sure you've seen the same thing with some people, even on this very forum.
But, if you observe him over the long haul, you will see that Kristol never helps our side.