I have heard in the name of R’ Avigdor Miller that it is a chillul Hashem for a jew to vote for a candidate that is pro gay rights, killing babies, etc. And regardless of whether or not RAM did indeed say this, it’s still a point worth thinking about.
“I would rather fight to maintain the purity of the poor little kids who are affected by this, than to rail against gay marriage.”
So would I, but why are the two mutually exclusive?