If you’re a resident of the Washington, D.C. area, including Maryland and Virginia, you can get free one-day gallery pass admission to the 2010 AT&T National at Aronimink Golf Club.
At the bottom of their sales page there is a Thank You Offer:
To express our gratitude to the local Washington, D.C. community, we are offering all Maryland, Virginia, and Washington D.C. residents free admission to the 2010 AT&T National at Aronimink Golf Club! Simply present a valid Maryland, Virginia or D.C. driver’s license at the gate to receive your Daily Gallery Pass for FREE!
A daily gallery pass is worth $20 for Tuesday or Wednesday, $40 for Thursday or Friday, and $45 for Saturday or Sunday. The event is from June 29th through July 4th. Tuesday and Wednesday are practice days and the tournament starts on Thursday.
It says you can just show up at the gate with your license but you can also reserve your ticket here, which will be mailed out 2 weeks prior to the event.