On the afternoon of September 9, New Jersey Governor Chris Christie vetoed AB 4237, a bill that the legislature had passed in June. The bill moved the state election (for 2013 only) from November 5 to October 16. Since the Governor already set the special U.S. Senate election for October 16, moving the election for state office would have saved $12,000,000 in election administration costs. September 9 was the deadline for the Governor to act. If he had done nothing, the bill would have taken effect.
The veto message said that voters would be confused if the state election were moved from November to October. Of course, if he had signed it soon after it passed, there would have been ample opportunity to educate voters that there was only going to be one election this year, in October. See this story.