Cindy Sheehan.

No one talks about her anymore. Have you noticed?

UPDATE: Good discussion in the comments, with many suggesting that Sheehan was marginalized for saying too many things that did not fit the specific needs of Democrats. Ironic -- isn't it? -- that she was useful precisely because she is a real person, but proved unusable because she is a real person. I'll give her credit for being more than a political tool. She said what she thought, a lot of which was flaky. It's an interesting lesson for politicos who are thinking of making a real person the centerpiece of a campaign.