when you have only two choices and you have to be quite insane to choose one of them, you are, for all intents and purposes, forced to choose the other side (same argument works for left and right if you hear someone say they are forced to be what they are politically)

I never claimed that anyone forced me to become a Democrat.

I support them at the national level because they're the least evil of the two and exactly two relevant options available, and the one which at least gives lip service to progressive values. But that is still like supporting Mussolini over Hitler. Locally I vote third party when I have a chance.

And I live in Texas so none of my votes matter anyway.