Not true. It might seem that way due to media coverage, but these things were a long time coming. The wheels have been turning since Reagan. There were also other events that changed the political climate like the Supreme Court judgement on the Bush/Kerry election. These events were threads that were pulled leading to those events.

I mean, the entirety of the nation’s gay population was able to get married pretty much out of the blue one day while Obama was president, but that had events leading up to it too.