Coming off their home win over the Chiefs, the Colts flew to FedExField for a Week 6 interconference duel with the Washington Redskins on Sunday night.  Indianapolis delivered the game's opening punch as quarterback Peyton Manning found wide receiver Pierre Gar&#231;on on a 57-yard touchdown pass, but the Redskins answered with running back Ryan Torain getting a 9-yard touchdown run.  In the second quarter, the Colts regained the lead as Manning hooked up with wide receiver Austin Collie on a 5-yard touchdown pass, followed by kicker Adam Vinatieri booting a 43-yard field goal. Washington began the third quarter with Torain's 1-yard touchdown run, yet Indianapolis replied with running back Joseph Addai's 13-yard touchdown run.  The Redskins would continue to remain close as kicker Graham Gano got a 39-yard field goal.  In the fourth quarter, the Colts continued to add onto their lead as Vinatieri got a 33-yard field goal.  Washington tried to rally as quarterback Donovan McNabb completed an 8-yard touchdown pass to running back Keiland Williams, yet Indianapolis' defense held tough to preserve the victory.  With the win, the Colts improved to 4-2 and remained in a tie atop the AFC South division.
Question: Which quarterback scored the longest passing touchdown?
Answer: Michael Vick