BUFFALO, N.Y. — Democratic state Sen. Timothy Kennedy won a special election Tuesday for the New York congressional seat vacated by Democrat Brian Higgins. Kennedy defeated Republican Gary Dickson for the upstate New York seat, helped by a 2-to-1 Democratic registration advantage in the district, which includes Buffalo, Niagara Falls and several suburbs. Kennedy has been in the state Senate since 2011. Describing Washington as “chaotic and dysfunctional,” he said he would focus in Congress on