After their tough home win over the Packers, the Colts traveled to take on the Jets at Metlife Stadium.  The Colts scoring took off in the first quarter with Adam Vinatieri's 20-yard field goal to take a 3-0 lead.  However, the Jets took the lead in the 2nd quarter with Mark Sanchez looking up with Stephen Hill for a 5-yard touchdown pass for a 7-3 lead.  They would later increase their lead with Shonn Greene's 10-yard run for a 14-3 lead.  However, the Colts were able to draw closer with Vinatieri's 50-yard field goal to make the score 14-6.  However, the Jets pulled away as Sanchez found Jason Hill on a 5-yard touchdown pass to make the score 21-6 at halftime.  The Jets went back to work as Shonn Greene ran for a 4-yard touchdown to make the score 28-6.  The Colts scored another field goal from Vinateri from 47 yards out to make the score 28-9, however the Jets wrapped the game up with Shonn Greene's 2-yard touchdown run to make the final score 35-9. With the huge loss, the Colts fell to 2-3 while rookie QB Andrew Luck would have his first career game without a single touchdown pass.
Question: How many points were the Jets leading by at halftime?
Answer: 15