Not bad. 30 comments before the first anti-Krauthammer shows up.
So, let me see. A couple years ago, Krauthammer praised Obama's political move when he caved on the Bush tax cuts. Other than that, I don't recall a single compliment about Obama's policies. In fact, Krauthammer has been relentlessly negative about 0's policies.
I've offered this challenge before but have never been taken up on it. Show me a citation from a reputable source (video or transcript would be acceptable) when Krauthammer supported Obama when conservatives did not.