ATLANTA — The candidates for Georgia governor came to their third and final debate ready to attack, ramping up their accusations on education, taxes and the economy. A little more than a week before Election Day, Republican Gov. Nathan Deal called his Democratic opponent Jason Carter an extreme liberal. Carter, a state senator, suggested Deal was out of touch with the state’s schools and economy. Carter, Deal and Libertarian Andrew Hunt met for their tensest debate of the campaign Sunday night at WSB-TV’s Atlanta studio. Recent polls suggest a tight race, and Hunt could draw enough votes to force a runoff.