The Green Bay Packers won over the visiting Arizona Cardinals at home as running backs Ahman Green and Vernand Morency each rushed for over 100&#160;yards, becoming the first Packers running back duo to accomplish that feat since the 1980s. Brett Favre threw for 180&#160;yards and one touchdown, as well as one rushing touchdown.  Leading Green Bay's receiving corps was Donald Driver, who had five receptions for 58&#160;Yards. Coming up behind him was David Martin, who had four receptions for 48&#160;Yards and one touchdown.  On defense, the Packers limited Cardinals rookie quarterback Matt Leinart to 14/35 for 157&#160;yards with one touchdown and one interception.  They also held Cardinals running back Edgerrin James to 84 rushing yards on 24 carries, along with three receptions for 25 receiving yards. Aaron Kampman was named NFC Defensive Player of the Week for his performance.
Question: How many incomplete passes did Matt Leinart throw?
Answer: 21