The Chargers returned home for a Week 8 fight with the St. Louis Rams.  In the first quarter, RB LaDainian Tomlinson completed a 2-yard TD run and a 38-yard TD run.  In the second quarter, the Rams climbed into the contest with RB Steven Jackson completing a 3-yard TD run for the Rams' only score of the period.  In the third quarter, San Diego gained some distance in their lead, as free safety Marlon McCree returned a fumble 79 yards for a touchdown.  St. Louis got a field goal, as kicker Jeff Wilkins hit from 34 yards out.  The Chargers also got a field goal, as kicker Nate Kaeding was good from 31 yards out. In the fourth quarter, San Diego RB Michael Turner scored on a 14-yard TD run, while Rams QB Marc Bulger completed a 7-yard TD pass to WR Shaun McDonald. The Chargers responded with QB Philip Rivers completing a 25-yard TD pass to Tomlinson, while Bulger completed a 6-yard TD pass to WR Kevin Curtis, in favor of St. Louis.  In the end, the Chargers improved to 5-2.
How many touchdowns were there in the first half of the game?
3