Because when all of us on the left were so crazy to think that going to war in Iraq might be a wee bit of a bad idea, and some of us marched around with a sign a couple of times, the media devoted most of what little coverage they gave of such protests to nutpicking, finding the lunatic.
Now we have a minor inconsequential movement of lunatics,* and they pretend not to notice.
*They're just the same nutty right wing we've always had, a bit more riled up due to who is in the White House and the current state of the economy. There's no actual organized movement to speak of.