Yes, you may ask, but I think you know the answer already. It's pretty much just a shtick that works in the radio show. Although Howard isn't always reliable and tends to suck up to George Bush, and Peter Costello DOES tend to stab Howard in the back.
Downer is not my natural voice. I have not used my normal voice in a radio series, and the closest I have is that of Carl the Swordmaster of Jambalaya Island.
There are times when I look around and think I'm not what I used to be. I whisper those words of wisdom... GST.