“A warrior praying for victory against his enemy is one thing, praying for the death of an elected official in one’s own country is quite another.”
Actually, David didn’t pray for victory against his enemy. I just read the passage in the O.T.
45 David said to the Philistine, “You come against me with sword and spear and javelin, but I come against you in the name of the LORD Almighty, the God of the armies of Israel, whom you have defied. 46 This day the LORD will hand you over to me, and I’ll strike you down and cut off your head. Today I will give the carcasses of the Philistine army to the birds of the air and the beasts of the earth, and the whole world will know that there is a God in Israel. 47 All those gathered here will know that it is not by sword or spear that the LORD saves; for the battle is the LORD’s, and he will give all of you into our hands.”
1 Samuel 17:45-47
That's right, he didn't pray for victory. He marched forth with the full confidence that the Lord God would give him victory!