That is why I think that it is so funny when people claim that Rush has been trashing their candidate. As you said he often goes out of his way to avoid giving the impression that he favors one conservative candidate over another. There are times when it is impossible for him to not make an observation that isn't complimentary.
There are also times when it is impossible for him to not make an observation that isn't damning.
Rush was REALLY slamming Bush yesterday.