Coming off their bye week, the Bills played a Week 7 duel with the San Diego Chargers.  In the first quarter, Buffalo drew first blood as kicker Rian Lindell got a 38-yard field goal.  The Chargers responded with QB Philip Rivers completing a 14-yard TD pass to WR Malcom Floyd.  In the second quarter, the Bills regained the lead with QB Trent Edwards (fully recovered from his concussion) completing a 2-yard TD pass to WR Lee Evans, along with Lindell getting a 27-yard field goal. In the third quarter, San Diego regained the lead with Rivers completing a 12-yard TD pass to WR Vincent Jackson.  Buffalo answered with RB Marshawn Lynch getting a 9-yard TD run.  In the fourth quarter, the Bills pulled away with Lindell nailing a 44-yard field goal. With the win, not only did Buffalo improve to 5-1, they also got their first 3-0 home start since 1995. A power outage at Ralph Wilson Stadium, caused by three helium balloons coming in contact with a transformer, led to portions of the game not being televised. For a short time during the first and second quarters, the game was played with no public address announcers, no scoreboard, and the time was kept by the officials on the field.
Question: How many touchdowns did Philip Rivers throw?
Answer: 2