Yes. Same sex marriage is a no brainer for conservatives. The government should have no business in dictating which gender you may marry. Hell Dick Cheney, one of the most hated conservatives by your types, has always supported SSM.Interesting article
Don't forget Bill Clinton was a big champion of DOMA only 20 years ago. And Barak Obama was not "evolved" just 5 years ago.
Most of the conservatives not on board are against SSM due to their first amendment protected religious beliefs.