CHICAGO — Even in President Barack Obama's hometown, they had hoped for more. Obama will be stumping for Senate candidate and basketball buddy Alexi Giannoulias on Thursday in Chicago, a city where every other person crossing the street seems to have a story about descending on Grant Park that historic night of the 2008 election or proudly watching the president take the oath on television. But nearly two years after Obama took office, while the president remains widely popular in the city, his image has slipped a bit as many people wonder where the promised change and jobs are, even...