Who was that masquerading as Dennis Miller on HBO?

When did Dennis Miller turn into a fullblown Rush and Cheney lover and official stand up comedian of the Republican party? I kept watching his new special tonight, waiting for him to crack up with laughter and explain that his jokes were just, well, a put on and that he’d get on to the real stuff. But. But he never did! I realize the last couple of years have affected some people more than others but this was over the edge. And just not funny.