Hmmmmm, what a great way to get people to back your cause or in this case bring attention to you as an artist.......it's human nature to support the underdog!
Oh no! The presidnt was made fun of! Call the secret service!
People get made fun of all of the time. Bush will, and it's not against the law. It's not like he scribbled "Bush is stupid lololololol" on a piece of canvas; it was art. Funny art at that.