Chicago authorities are bracing for as many as a million people in downtown Grant Park Tuesday night to cheer on Sen. Barack Obama as election returns come in, a potential celebration and security headache. Police in Chicago and elsewhere around the country say intense interest in the election and the possibility of large crowds in major cities are leading them to take crowd-control precautions usually seen during Super Bowls and World Series. In addition, local police will be providing security at polling stations to keep things running smoothly on Election Day. Security preparations in Obama's hometown include orders for off-duty...