46. Erin Stewart — In 2013, at age 26, Stewart ousted Democrat Tim O’Brien in a contest for the mayorship of New Britain, Connecticut, and won a resounding re-election this past November. According to The Hartford Courant, “Republicans in the state are talking about Stewart as a possible candidate for governor in 2018, while Democrats at the Capitol wonder if she might take a run at U.S. Rep. Elizabeth Esty’s seat this fall.”