After defeating the Cardinals at home, the Redskins flew to Texas Stadium for an inter-conference game with the Dallas Cowboys.  The Cowboys led early when QB Tony Romo completed a 21-yard TD pass to TE Jason Witten in the first quarter.  In the second quarter, Washington responded with 17 points. QB Jason Campbell threw touchdown passes of 3 & 2 yards to WR James Thrash and WR Antwaan Randle El respectively, and kicker Shaun Suisham added a 20-yard field goal.  Dallas ended the first half scoring with a Nick Folk 36-yard field goal. In the third quarter, the Cowboys tied the game with Romo throwing a 10-yard TD pass to WR Terrell Owens. The Redskins answered with a 33-yard field goal by Suisham.  In the fourth quarter, Washington increased its lead with Suisham field goals of 33 and 29 yards. Dallas would score late in the game with an 11-yard Romo completion to WR Miles Austin.  The Cowboys then attempted an onside kick, however, the kick was recovered by the Redskins and they were able to seal the victory. Also, head coach Jim Zorn became the first Redskins rookie head coach since George Allen to earn a victory over the Cowboys in Dallas on his first attempt.
Question: How many yards was the longest touchdown pass?
Answer: 21