Answer based on context:

With two straight home wins under their belt, the Panthers flew to FedExField for an intraconference fight with the Washington Redskins. In the first quarter, Carolina struck first with kicker John Kasay getting a 42-yard field goal for the only score of the period. In the second quarter, the Redskins tied the game up with kicker Nick Novak getting a 42-yard field goal. Afterwards, the Panthers regained the lead with Kasay's 51-yard field goal as time ran out on the half. In the third quarter, Carolina's lead was gone when QB Jason Campbell completed a 4-yard TD pass to WR Antwaan Randle El for the only score of the period. In the fourth quarter, the Panthers regained the lead with QB Jake Delhomme completing an 8-yard TD pass to WR Steve Smith. However, it was not meant to be as Washington got the win with Campbell's 66-yard TD pass to TE Chris Cooley. With the loss, the Panthers fell to 6-5.

How many yards was the longest touchdown pass?
66