You cannot vote for someone in a representative democracy that will enact things against your principles. Voting Democrat, regardless of the quality of character of the representative, would be a betrayal of principles for the people who believe things like “abortion is murder”.

The made up quotation is a style designed to illustrate how dumb of a suggestion that is to people who vote on single issues.

It’s how single issue voters think regardless of Democrat/Republican. They ignore the representative’s moral failings and pick the one that will execute their policy desires.