Associated Press | The futures and options broker MF Global Holdings says former New Jersey Governor Jon S. Corzine is joining the company as chief executive and chairman. Effective immediately, the 63-year-old replaces Bernard W. Dan, who resigned as CEO for personal reasons. Dan was the CEO of the Chicago Board of Trade for several years, before it merged with the Chicago Mercantile Exchange. He will remain through May 16 to help with the transition.