the 2008 vermont democratic primary was an open primary that took place on march 4, 2008. barack obama won the primary, his only decisive win among the four march 4 contests. the primary determined the 15 pledged delegates that represented vermont at the 2008 democratic national convention. the delegates were awarded to the candidates, obama and hillary clinton, on a proportional basis. vermont also sent 8 unpledged "superdelegates", to the convention not bound by the results of the primary.