Jeff Jarvis is all over this.

Says PoliticsNJ.com:
If McGreevey were to resign before September 15, New Jersey would have a special gubernatorial election on November 2, 2004. If he were to resign after that date, Codey would hold the office until the end of McGreevey's term in January 2006.

He is likely going to announce a resignation after Sept 15th, but this _should_ work like California. We should draft Bruce Springsteen. Bruce Willis even, if we must stick to an actor. Lots of good actors from New Jersey.