"Those sternly-worded statements would have worked if not for Bush"
Now that you point it out, that's a pretty good approach for the U.N. and liberals to take, too.
I've seen the entire gamut of "blame Bush" in this, including complaints that he's not involved enough, complaints that he's too involved, complaints that he's pushing a military solution, and complaints that the war in Iraq is preventing him from taking a military solution.