This kind of prayer is certainly not unbiblical. David praciticed it often. Psalm 58:6: “Break their teeth, O God, in their mouth: break out the great teeth of the young lions, O LORD.
7: Let them melt away as waters which run continually: when he bendeth his bow to shoot his arrows, let them be as cut in pieces.
8: As a snail which melteth, let every one of them pass away: like the untimely birth of a woman, that they may not see the sun.
9: Before your pots can feel the thorns, he shall take them away as with a whirlwind, both living, and in his wrath.
10: The righteous shall rejoice when he seeth the vengeance: he shall wash his feet in the blood of the wicked.
11: So that a man shall say, Verily there is a reward for the righteous: verily he is a God that judgeth in the earth. “
Want something from the New Testament? Luke 19:27 - “But those mine enemies, which would not that I should reign over them, bring hither, and slay them before me. “ That’s meek and mild Jesus talking.
Some of us Christians have a lot to learn about spiritual warfare. Yes, it says, we wrestle not against flesh and blood. Nevertheless, if God is telling this man to pray thus, then I won’t come against him.
The thing about this kind of prayer, or any prayer, is that it’s out of our hands and into God’s hands, and if He chooses to take Obama, that’s as it should be. If he refuses, God’s right and the praying man hasn’t lost anything.
Spiritual warfare, folks. Learn it. It starts with studying the Bible until we’re familiar with all of it. It’s no good to run with part of it.