Freedom to Marry has set up the Win More States Fund with the goal of influencing legislation in Maine, Minnesota, New Hampshire, New Jersey, and Washington. Interestingly, the fund’s largest donors so far have been a group of major donors to the Republican party.

Freedom to Marry is one of the many organizations in the US that support and fight for the legalization of same-sex marriage
This shows quite the shift, especially compared to popular (if slightly under-informed) consensus about party alignment on the gay marriage debate.
Freedom to Marry quotes Mehlman talking about his decision to donate:
“Supporting the right of adults to marry the person that they love is consistent with Republican and conservative principles. A party that ignores reality and demographic change is a party that loses a lot of elections and becomes less relevant.”

Freedom to Marry’s Win More States Fund targets Maine, Minnesota, New Hampshire, New Jersey, and Washington State
But that’s how things work, I guess. People have a tendency to distrust things that are different and strange, and so social change with respect to accepting and adapting to differences usually has more to do with social pressure (and shame) than with lots of miraculously-timed personal insights. The fact that our opinions and actions are inseparably intertwined with the popular sentiment is not news. And while political moves responding to trendy or controversial social issues might be occasionally disingenuous, there’s no arguing that they can instigate actual change.