He probably already has enough support to keep her and get rid of Tom but he is still lobbying. Everyone is on to his alliance with Liza, yet he is still denying it, all the while still lobbying for her. And I saw him telling some lies about it to Jillian trying to establish some goofy cover story and you could tell that even she was not buying it. At this point he may need to go ahead and let Liza get voted out, or this may come back to bite him later. But if he is as smart as he thinks he is (and he seems) he will figure that out. It is hard to say for sure who the house is going to vote out. They are all tossing around scenarios.