Why did Gov. McGreevey's succesor take the oath a day early?

Governor McGreevey resigned effective 11:59 AM Monday so why did state Senate President Richard Codey take the oath on Sunday the day before he became Acting Governor?

The ceremony was done privately; the news says it was because he didn’t think it was appropriate to have a full-blown ceremony, considering the circumstances of Gov. McGreevey’s departure. Doing it a day early jumps the gun very effectively and removes the story from the media.

As opposed to contestants on reality shows, I think he’s sort of an anti-fame-whore. I think the scuttlebutt is that this guy does not want to continue being governor after his 14 months are up.