he said that the government should have absolutely no power over marriage, and that while he is against gay marriage, he is aware that his opinion on it does not and should not matter.

A) He's definitely more for straight marriage than he is for gay marriage. He argued against SCOTUS' saying you couldn't ban gay marriage (if that sentence construction had too many negatives: he's publicly supported banning specifically gay marriage).

B) Gay marriage is nowhere near the only gay issue/right at stake. E.g., he's questioned their ability to raise children. That's not much better than opposing their marital rights (which he also does when asked about that specific case).