It's inappropriate to talk about current politics at any dinner party, ever, or even worse, to assume that everyone you know thinks like you do. Almost always the topic (along with sex and religion, categorically) leads to disaster, outrage, gnashing of teeth. We entertain our friends and go to parties to relax and enjoy ourselves, not to get blood boiling.
When you are at a party and the talk goes to politics, even when everyone agrees with each other, turn to your neighbor and begin another subject or else take a break. Find the powder room, find seconds, find another bottle of wine. There are finer things to discuss during social situations.