That’s because Bush is not a lib. Double standard.
The SS is not known for being politically biased. KC is correct. It's a mater of numbers.
No matter who the President is, there are probably a million Americans who would shoot him if they felt they could get away with it. If you were a bodyguard who had to worry about that, would you be investigating a poster referencing a character who says in the movie that he cut his own face up? I would be looking for real threats, and so will the SS.