I watched this part of his show. His jokes weren't funny and he kept telling him while his audience failed to laugh. I can't imagine why he kept going.
His two big Bush jokes really bombed with the audience - he had to literally beg for reaction, and accused the audience of "not being able to take a joke" for each one.
The first was a lame attempt to be clever about the so-called "wedding party" at the safe house at 2 or 3 AM - he called it an attack on a "gay wedding". But death is not funny and he should have known better.
I don't recall the second, but it was less clever - and even less amusing - than the first, and elicited the same reaction. That was when I shut it off.