This entire piece from John Piper is well worth your time. I found the following “Word to Pastors” especially poignant:

“May I suggest to pastors that in the quietness of your study you do this? Imagine that America collapses. First anarchy, then tyranny — from the right or the left. Imagine that religious freedom is gone. What remains for Christians is fines, prison, exile, and martyrdom. Then ask yourself this: Has my preaching been developing real, radical Christians? Christians who can sing on the scaffold, Let goods and kindred go, This mortal life also; The body they may kill: God’s truth abideth still; His kingdom is forever.”

I do disagree with Piper when it comes to his apparent choice to either not vote or to vote for a third-party candidate. (See Thomas McKenzie’s thoughts here, which I largely agree with.) Nevertheless, he offers an excellent reminder that, no matter who wins this next election, we Christians have our work cut out for us to hold our leaders accountable.