Byron Leftwich led two touchdown drives after Ben Roethlisberger reinjured his throwing shoulder and the Pittsburgh Steelers beat the Washington Redskins 23-6 on Monday. The Steelers' top-rated defense had seven sacks, allowed only 221 yards and became the first team to intercept Jason Campbell. Leftwich went 7-of-10 for 129 yards and a touchdown as the Steelers (6-2) beat an NFC East team for the first time in three attempts this season. Roethlisberger was 5-of-17 for 50 yards and an interception before leaving the game at halftime, again hindered by the slightly separated shoulder. While the Steelers remain atop the AFC North, the Redskins lost ground in the NFC East to the New York Giants. Washington enters its bye week needing to tweak an offense that has put together promising drives all season but has often struggled to find the end zone.