He's not selling out anyone, he was making a personal comment about the emotional side of going through a scandal like this. He wasn't making any commentary on homosexuality.
He specifically stated that McGreevey's life would improve now that he was no longer living a lie. That is the equivalent of stating that accepting homosexual desires is a natural and positive thing to do. Only someone with no concept of right and wrong and basic morality would make such a claim.
Rush has announced many times that he is a male lesbian. Well, hell, so am I. The cool thing about having deviant behavior in your genes is that it gives you license to screw other people (figuratively), counter your vows, claim discrimination whenever anything goes against you...it even qualifies you to be an Episcopal bishop these days.