Senate President Dominick Ruggerio says Coventry Senator Nicholas Kettle's decision to resign avoids requiring his colleagues having to consider expulsion.  Ruggerio says that while he respects Kettle's right to due process, the Senate has an obligation to ensure a safe working environment.  Kettle is charged with extortion and video voyeurism.  He's accused of extorting sex from a Senate page and sending explicit photos of his ex-girlfriend to a man in New Hampshire.