I think Williams comparing Obama to Nixon was exactly what Krauthammer was getting at. We know the media loves the dems. Something inside them is fighting against this negative narrative. By vocally agreeing with the media - who believe they’re “doing something wrong” by going after the dems - the Republicans run the risk of turning the media against them.
Krauthammer believes by the republicans keeping quiet, the media will continue the negative Obama narratives. He saying when your enemy is making a mistake - let him.
Pros and cons to both approaches - probably no right or wrong way to go about it.
They are only attacking Obama because they feel he wronged THEM. The risk is that by piling on, the media will go back to its first love, that being Obama.