New York — As a Democrat who immersed himself in political news during the presidential campaign, Ziad Aunallah has much in common with many Americans since the election. He’s tuned out. “People are mentally exhausted,” said Aunallah, 45, of San Diego. “Everyone knows what is coming and we are just taking some time off.” Television ratings — and now a new poll — clearly illustrate the phenomenon. About two-thirds of American adults say they have recently felt the need to limit media consumption about politics and government because of overload, according to the survey from the Associated Press-NORC Center for