Hoping to rebound from their loss to the Seahawks the Chargers played on home ground for an inter-conference duel with the Cardinals. In the 1st quarter the Chargers took the early lead as QB Philip Rivers completed a 33-yard TD pass to TE Antonio Gates, but had a problem maintaining this lead in the 2nd quarter when FS Kerry Rhodes recovered a fumble and ran 2&#160;yards to the endzone for a touchdown. After that, the Chargers went on a scoring rally with FB Mike Tolbert making a 5-yard TD run, followed by Rivers making a 26-yard TD pass to TE Antonio Gates. Then OLB Shaun Phillips successfully caught an interception and ran 31&#160;yards to the endzone for a touchdown. This was followed in the 3rd quarter by kicker Nate Kaeding making a 48-yard field goal. Then RB Ryan Mathews got a 15-yard TD run. This was followed in the 4th quarter by Kaeding nailing a 47-yard field goal. The Cardinals tried to cut the lead, but only came away with kicker Jay Feely's 53-yard field goal.
Question: How many defensive touchdowns were scored?
Answer: 2