15Then the Pharisees went and plotted to entrap him in what he said. 16So they sent their disciples to him, along with the Herodians, saying, “Teacher, we know that you are sincere, and teach the way of God in accordance with truth, and show deference to no one; for you do not regard people with partiality. 17Tell us, then, what you think. Is it lawful to pay taxes to the emperor, or not?” 18But Jesus, aware of their malice, said, “Why are you putting me to the test, you hypocrites? 19Show me the coin used for the tax.” And they brought him a denarius. 20Then he said to them, “Whose head is this, and whose title?” 21They answered, “The emperor’s.” Then he said to them, “Give therefore to the emperor the things that are the emperor’s, and to God the things that are God’s.” 22When they heard this, they were amazed; and they left him and went away.
I ran across this sermon from Duke Chapel by (now) Bishop Will Willimon, then Dean of the Chapel at Duke. It was preached in 1999, the year before an election year. Nine years later, weeks away from an election, This sermon is a good read today.