One Way Iraq is not Like Vietnam

In the Vietnam era in the United States you used to hear arguments between passionate supporters of the war and opponents of the war. Now I can't recall a single "water-cooler" or family discussion where anyone defended the Iraq War. There is zero real, passionate support for it among the public.

Why, then, do BOTH parties still support it? Why isn't there even a pretense of responding to the public will? Is it that the Diebold voting machines have completely insulated any politician from public backlash? It's really the strangest disconnect.