^This. Gay people have many factors to consider while choosing who to vote for, not just their sexual orientation.
Well, I don't. If a Labour candidate supported re-nationalization of the public utilities, the scrapping of Trident, the decriminalization of all drugs, the abolition of private schools, a substantial increase in the minimum wage, a crackdown on Zero Hour contracts etc...but was iffy on gay rights, then such a candidate would not get my vote. Though I likely wouldn't vote for his/her pro-gay Lib Dem/Tory/UKIP opponent either.
Oh! I just recalled the existence of the Green Party. Yeah, their candidate would probably get my vote in the above scenario.