My wife and I regularly pray for the President as well. We sent a message to the White House a few weeks back, and amazingly we received an email message from the President thanking us for our prayers. I am sure it was a sort of form letter email, but it was signed by him and cited his thanks for praying.
The “Secret Weapon” the President has against the wicked Left and their demonic minions is prayer. If God is for us, who can be against us?