Frank, Kucinich may indeed be totally honest about his views, but that doesn't change the fact that his views appeal primarily to the far left of the Democratic Party, and I believe most Dems, and Republicans too, are desperate to see a power shift back to the center.
For example,I don't believe that most of the electorate advocates or desires immediate withdrawal of troops from Iraq, whether or not they agree with the motivation for and execution of the war. And I can't see how politically correct newspeak like "the Department of Peace" would change the fact that negotiating and keeping peace is the legitimate charge of the State Department, and that appropriate and necessary use of force should be in the charge of the sensibly-named Department of Defense. If these powers are being incorrectly applied, the solution is to reform those institutions, not create another full level of bureaucracy.
But my point is not to argue Kucinich's specific proposals. He has had a hearing at each of the debates. If his ideas were going to gain traction in public opinion, they would be doing so now, regardless of media coverage or lack thereof.