I vote for the party that wants to protect abortion rights. It would take quite a lot for me to vote for any anti-abortion Republican. I think Trump-level disrespect for democracy from the hypothetical Democrat would be enough to change my vote, but I’m not sure some people I know would vote for the Republican even then. Would expecting Republicans to vote for Biden be a double standard in this context?
(What this doesn’t explain is why Trump was so overwhelmingly popular in the primaries.)