Before he was Trump's running mate, Mike Pence led the anti-LGBT backlash

Mike Pence first rose to the national stage during a crisis that pundits said had “exploded”, “plummeted” and “crumbled” his chances of representing the GOP in the next presidential election.

It was March 2015 and same-sex marriage was on the verge of becoming legal nationwide – carried by probably the swiftest change in public opinion in US history – but the Indiana governor and establishment favorite going into 2016 was standing firm....
https://www.theguardian.com/us-news/2016/oct/04/mike-pence-led-anti-lgbt-backlash-trump