Stanley Hauerwas famously says: "[The phrase] 'Jesus is Lord' is not my personal opinion; I take to be a determinative political claim."
I think that's true only when we assume that the purpose of politics is to bring about the eschaton. This is what some theologians call "over-realized eschatology".
It's wrong as John 18:36 and Luke 17:20-21 tell us that God's kingdom's policy does not materialize in this world. But politics' policy does. If there's convergence between kingdom's and politics' policy, it's coincidental and temporal until the end of (in Augustinian phrase) "secular" time.