This guy will not be forced to vote to expose his leftist leanings until after the 2018 elections. His vote would make no difference at this point, so he will get freedom to pretend he is more centrist.
After 2018. All bets are off. He goes far left or he gets the stink eye. He knows that too.
You make a good point that he will be allowed to maintain his camouflage through another election cycle.