Comcast SportsNet Houston, the city's struggling sports channel, has asked a judge to push back a key deadline in its chapter 11 case while its executives figure out how to turn around the channel, Dow Jones Daily Bankruptcy Review reported today. Attorneys for Comcast SportsNet Houston, which broadcasts Astros baseball and Rockets basketball games to fewer than half of the city's households, said in court papers that they need at least 30 additional days to propose an outline of its bankruptcy-exit plan.