STOWE, Vt. — Looking back, gubernatorial candidate Dean Roy says his political ambitions started in the eighth grade. And by that he means, last year. After working as a legislative page at the Vermont State House, the 14-year-old freshman at Stowe High School now has his sights set on the corner office. In November, he’ll be the first candidate for governor under age 18 to appear on the state’s general election ballot.