I was listening to the Focus on the Family broadcast on the way home from work on Monday.  Dr. Dobson had returned from a meeting in Washington and said that President Bush had requested prayers for a "shield of protection" over the US.  I did not hear anything in the MSM - no surprise there.  I have not seen anything on the internet.  It was a request made during Dr. Dobson's introduction of his program.  I don't know when the meeting was or what the name of it was.