Many of the (supposed) Christians I know have lost their first love. You can tell by the way they live. A Christian obeys Jesus and follows Jesus rather than being invested in a political process. If I person is more invested in conservative (or liberal) politics, I don’t care what they say they believe. They are lukewarm, at best, Christians.
In this post on how a Christian lives, Randall McRoberts writes about putting the focus on your faith and dying to self.