Ever since TSA's creation after 9/11, passengers willing to undergo a pat-down and hand-search have been able to fly without ID. This rarely discussed, and little used right was documented by the courts in Gilmore v. Gonzales. While mostly just a way to assert your rights, the technique often had the added benefit of allowing the traveler to skip to the front of the security line.Link
With little warning, on Thursday, TSA announced a new change in policy. Passengers who refuse to show ID, citing the rights, will be refused entry to the boarding area. Passengers who claim to have lost or forgotten their ID will still be allowed to fly.
This new rule seems to only apply to terrorists that are unable to lie, while at the same time, massively cutting into the rights of passengers.