To repeat a couple facts:
1) Apparently, there is a significant segment of the U.S. population who would not dream of voting for Democrats because of the perceived “immorality” of “liberals.”
2) A large percentage of U.S. citizens do not vote, in part because they are disgusted with the political process and/or politicians.
If one wants to advance the liberal or progressive cause, one either has to convince the die-hard Republican “base” (and “religious” conservatives around the world) that liberals are not “immoral” or convince those who don’t vote to vote.