I'm in favor of the separation of church and state; not so much because I worry about the church getting involved in my government--but political behavior impacting my church.
I'm not one of those Christians who warn people of faith away from politics, but I always caution my Christian friends not to rationalize what passes as normal behavior in the political world (like encouraging contempt for the opposition) as acceptable behavior for believers.
It's can be very discouraging when pastors model abhorrent political behavior. Leaders shouldn't compromise their beliefs, but they should respect differences and also realize that the rules of behavior are pretty much set for Christians.
Here's a writer that gets it.
Some points that really resonated with me as a political activist:
When media personalities tell you they are on a moral crusade, they are lying to you.
...if you’re mocking your governing leaders on Facebook, the Holy Spirit is grieved.
The country is not going to be destroyed if your candidate loses.
This is [not] the most important election in the history of our nation.