By DCist Contributor Ryan J. Reilly A high-school gymnasium was the perfect forum for a town hall meeting on health care reform hosted by Rep. Jim Moran (D-Va.) in Reston last night, which at times took on the atmosphere of a match between bitter rivals. Howard Dean’s appearance attracted crowds on both sides of the debate, a large pool of local and national media as well as vocal protesters vying for their attention. Moran and…