BOSTON— A Republican who qualified yesterday to challenge Sen. Edward M. Kennedy said the longtime Massachusetts Democrat should be ousted from office because he is responsible for the Persian Gulf and Iraqi wars, despite voting against congressional authorization for each. Kenneth G. Chase, a language school owner from Belmont, said Kennedy — and not the Republican presidents who launched each war — was responsible because he had not insisted on an energy policy that weaned the United States from its dependence on foreign oil. “The nation’s at war, and the war was easily avoidable,” Chase said. “If we didn’t...