Dana Milbank catalogues the wackiness of Cindy Sheehan.

How outside the mainstream is Sheehan? Even left-wingers have ostracized her:

The left-wing Daily Kos Web site banned her postings because of her challenge to Pelosi. Britain’s Guardian newspaper, which has a large antiwar following, ran an article titled “The epic narcissism of Cindy Sheehan.”

How strange is her understanding of reality? She claimed impeachment is mandated under the Constitution:

“If Nancy Pelosi doesn’t do her constitutionally mandated job by midnight tonight, tomorrow I will announce that I am going to run against her,” Sheehan announced outside the cemetery’s gates yesterday. “I will beat her in California.”

Sheehan then waded into constitutional law, and the little- known mandatory impeachment clause. “Impeachment is not a fringe movement — it is mandated in our Constitution,” she asserted. “Nancy Pelosi had no authority to take it off the table. If she takes impeachment off the table, what else will she take off the table — the First Amendment?”

How paranoid is Sheehan?

[B]y yesterday Sheehan even thought the planes departing from National Airport were conspiring against her. “They stepped up the air traffic,” she complained as a jet interrupted her speech.

If you’re interested, Milbank made an accompanying video report on Sheehan’s protest march in Washington yesterday. It features a man with a President Bush mask and a devil suit as well as a Free Republic protester yelling about “sex, drugs, and Geritol.”