Answer based on context:

Following their outstanding home win over the Lions, the Falcons flew to Raymond James Stadium for a Week 2 NFC South duel with the Tampa Bay Buccaneers.  In the first quarter, Atlanta trailed as Bucs QB Brian Griese completed a 5-yard TD pass to TE John Gilmore.  In the second quarter, the Falcons continued to trail as former Falcons RB Warrick Dunn gave Tampa Bay a 17-yard TD run, along with kicker Matt Bryant getting a 33-yard field goal.  Atlanta would close out the half with kicker Jason Elam getting a 32-yard field goal.In the third quarter, the Falcons crept closer as Elam kicked a 27-yard field goal.  In the fourth quarter, Atlanta tried to rally as Elam nailed a 24-yard field goal.  However, the Buccaneers pulled away as RB Earnest Graham got a 68-yard TD run.With the loss, the Falcons fell to 1-1. With Michael Turner running for a franchise-record 220 yards in his Falcons debut, Ryan only threw the ball 13 times against Detroit. Sunday, he had more attempts than that in the first half alone. The Bucs limited Turner to 42 yards on 14 carries. WR Joey Galloway, who did not play in the preseason because of a sore groin, sprained an ankle in the fourth quarter. Falcons rookie LT Sam Baker was hit in the head in the first half and did not return. A week after beating Detroit in his pro debut, Matt Ryan threw incompletions on his first nine passes before settling down to keep Atlanta in the game with three field goal drives that trimmed a 17-point deficit to eight with five minutes to go.

what was the longest TD?
68-yard