David Johnson needed a couple of plays to realize that life as an NFL running back is a lot different than it was at Northern Iowa. Then he did just fine. Johnson had 66 yards rushing on 13 carries in his NFL debut, San Diego had six first-half sacks, and rookie Josh Lambo kicked a 42-yard field goal as the game ended to give the Chargers a 22-19 preseason victory over the Cardinals on Saturday night. Read more http://espn.go.com/nfl/recap?gameId=400791779
