STAMFORD — There’s a chance on Nov. 7 that the Board of Education could remain as is if voters are happy with the state of Stamford Public Schools, as Democratic incumbents Jackie Heftman, Andy George, and Betsy Allyn vie for three open seats. But with three more outside candidates running — Republican Dan Mena, Green Party candidate Jackie Pioli, and unaffiliated candidate Theresa Robbins — there’s the possibility voters might swing for the unknown.