Hoping to get win #1, the Lions returned home for an NFC North battle with the Green Bay Packers.  The game started off with a close first quarter, as QB Brett Favre threw his 400th career touchdown pass, by completing a short pass to rookie WR Greg Jennings who took the ball 75 yards for a touchdown.  Detroit would tie the game up as QB Jon Kitna completed a 37-yard TD pass to RB Shawn Bryson.  Green Bay would take the lead again as DB Marquand Manuel returned an interception 29 yards for a touchdown, but the Lions would tie the game again as Kitna completed a 42-yard TD pass to WR Roy Williams as time ran out of the quarter.  In the second quarter, however, the Packers retook the lead for the only score of the period, as kicker Dave Rayner booted a 24-yard field goal.  In the third quarter, both sides shared a touchdown with each other.  Green Bay got a 5-yard TD pass to WR Donald Driver and Detroit got a 5-yard TD run by RB Kevin Jones.  In the fourth quarter, the Packers got some distance, as Favre completed a 4-yard TD pass to RB Ahman Green.  The Lions would get a 40-yard field goal by kicker Jason Hanson, but that would be as close as Detroit would get, as they dropped yet another game for the 2006 season as the team fell to 0-3.
Question: How many points were the Packers leading by at halftime?
Answer: 3