When Richard Codey, the president of the New Jersey Senate, succeeded Gov. James McGreevey at the stroke of midnight on Monday, he won the dubious prize of 14 months in one of the most powerful - and most burdened - of the nation's gubernatorial offices. Before the clock strikes too many more times, he should act to fix the biggest of the state's numerous messes. Mr. Codey would do well to start with New Jersey's porous code of ethics. Mr. McGreevey, who was no stranger to the state's "pay to play" politics, in which candidates take contributions from state contractors,...