The white Christian's party affiliation is usually a closely held secret (at church at least), but they are constantly on the lookout for subtle cues that betray someone's ideology. Any mention of "social justice" is a dead giveaway that someone is a liberal, while bringing up abortion or "values" identifies the conservatives. Once a white Christian is 100% certain that his fellow churchgoer is of the same political persuasion, he will feel comfortable uttering the odd comment about "God-less tax raisers" or "cold-hearted capitalists" and will begin sending this person daily email forwards comparing a politician they don't like to Hitler.
The pastor is ever careful to avoid politics in the sermon. If there is a major political issue such as an election, war, or invalid about to be removed from life support, the pastor will mention these matters and then pray that "the Lord's will be done." This is very clever because both the secret Christian Democrat and the secret Christian Republican know that their political party is much more in line with the Lord's will than the other party and they are reassured that the pastor shares their political beliefs.
Following these simple rules allows the secret white Christian Democrat and the secret white Christian Republican to live in harmony. They each know that the Lord agrees with them and cannot fathom how any right-thinking Christian could believe otherwise.