Feeling let down by a president they once had high expectations for, blacks, Hispanics and younger voters are starting to give up on President Obama. Pollster John Zogby told Secrets that his latest poll found a big drop in support for the president among the three key constituencies who feel that Obama hasn't delivered the results he promised in his reelection campaign. "These three groups all have high expectations and feel a sense of ownership because of their strong support," the pollster said. "He is losing some of the strength he once enjoyed among groups that have formed the nucleus...