There are some who can and some who can’t. Our country is full of “cultural affiliates” who prefer a party mostly based on loose social experiences they’ve had. They like the idea of the Democrats or the Republicans, but couldn’t really detail what exactly they like. This pairing is easy,
stay off the topic and don’t get confrontational.
More difficult is the informed and passionate political supporter. Not only do they tend to have information that supports their position, they often have a blind hatred for the other party that no amount of discussion can dissipate. If this is your situation, watch this video with your partner, and if it’s still tense, then it may be time to secede from the union.