TAMPA, Fla. (AP) — Barack Obama radiated confidence and John McCain displayed the grit of an underdog Monday as the presidential rivals reached for the finish line of a two-year marathon with a burst of campaigning across battlegrounds from the Atlantic Coast to Arizona. “We are one day away from change in America,” said Obama, a Democrat seeking to become the first black president — a dream not nearly as distant on election eve as it once was. McCain, too, promised to turn the page of the era of George W Bush.