There is a song in the play/movie "Best Little Whorehouse in Texas," sung by just the sort of politician the original post described (and, yes, George W., like Jerry Springer, is NOT representative of Americans on the whole) that was titled "Oooh, I Like to Dance a Little Sidestep!" It involved the politician purposely evading reporters' questions and then bragging about how much non-information he had communicated (sic).

I've heard the term "side-stepper" used in this context.