The government's lead witness in the Department of Justice lawsuit against AT&T derided an arbitration offer designed to show good faith to cable programmers as it looks to close its $85 billion acquisition of Turner parent Time Warner. In his relentless cross-examination, defense attorney Daniel Petrocelli scoffed that she “should have done some homework” before testifying. Suzanne Fenwick, VP of content acquisition for Cox, said an offer to allow any carriage disputes…