A White House petition about the TSA's screening procedures was 90 percent of the way to completion when Wired ran a story giving it a final push. The White House's petition site went down for unannounced maintenance, and when it came back up, the petition had "expired" -- though the Electronic Privacy Information Center says it still had time left on the clock:
At approximately 11:30 am EDT, the White House removed a petition about the TSA airport screening procedures from the White House "We the People" website. About 22,500 of the 25,000 signatures necessary for a response from the Administration were obtained when the White House unexpectedly cut short the time period for the petition. The site also went down for "maintenance" following an article in Wired that sought support for the campaign.
Update: The petition's creator reportedly disputes EPIC's version of the timeline, saying that the petition had run out its time during the outage.