We don’t ascribe to the world the greatest status. There are unseen things that are vastly more precious than the world. We use the world without offering it our whole soul. We may work with all our might when dealing with the world, but the full passions of our heart will be attached to something higher—Godward purposes. We use the world, but not as an end in itself. It is a means. We deal with the world in order to make much of Christ.
So it is with voting. We deal with the system. We deal with the news. We deal with the candidates. We deal with the issues. But we deal with it all as if not dealing with it. It does not have our fullest attention. It is not the great thing in our lives. Christ is. And Christ will be ruling over his people with perfect supremacy no matter who is elected and no matter what government stands or falls. So we vote as though not voting.
John Piper in "Let Christians Vote as Though Not Voting"