This blog post on beliefnet about using Psalm 109 as a prayer for Obama, as some people have been doing, is so good I can’t think of anything I would like to add. I urge you to check it out and to remember:
Let every person be subject to the governing authorities. For there is no authority except from God, and those that exist have been instituted by God.
Let us pray for his success not his failure and demise.