WASHINGTON (AP) - President Bush opens the fall campaign with a slight lead over Democratic Sen. John Kerry, an Associated Press poll shows, as voters express growing confidence in the direction of the country and the performance of the incumbent. Seven weeks before Election Day, the Republican is considered significantly more decisive, strong and likable than Kerry, and he has strengthened his position on virtually every issue important to voters, from the war in Iraq and creating jobs - two sources of criticism - to matters of national security and values. Since the Democratic National Convention ended in late July,...