Middlesex County Democrats will hold a special convention on September 2 to replace Jack O'Leary as their candidate for State Assembly in the 19th district. O'Leary dropped out on Monday after a series of ethical woes made Democrats nervous, especially since he was looking to replace an incumbent under federal and state indictments. The leading candidate continues to be former Superior Court Judge Mathias Rodriguez of Perth Amboy. Woodbridge Councilman Charles Kenny is also reportedly mulling an Assembly bid. O'Leary, who is not happy with his fellow Democrats over the circumstances that led to his withdrawal, has not endorsed a candidate in the race.