Kinda hard to live with one's self and vote against your own interests, methinks.
So, what you're saying is that politicians, once elected, should just say F-ck you to the wishes of those who elected them and that politician should just vote for his/her own interests? Doesn't that sort of defeat what constituents elect their representatives to do? How long would said politician last in the job and get re-elected by ignoring the wishes of his/her constituents?
The thing is, he probably never would have been elected (as a member of he GOP) had he run as a conservative yet out-gay man.
Since being closeted is virtually a requirement for being a GOP politician - especially in the homophobic Midwest USA - I won't hold that against him in the least.
It is possible for a man to maintain his integrity. He should have at the very least abstained from votes against basic human rights issues - or best yet, informed his constituency that he cannot in good conscience vote against these rights. It might ruin his career going forward, but at least he wouldn't be a liar.
The hypocrisy of this man is claiming to be against LGBT rights while presumably enjoying his share of what his handlers might term "the homosexual lifestyle choice".
This is different than say, being of a personal opinion about raising a particular tax, but voting the will of his constituency to lower the tax contrary to his opinion.