Prominent Democrats only whisper when they compare Obama, the first African-American with a serious chance to be president, with what happened to Los Angeles' black Mayor Tom Bradley a quarter of a century ago. Exit polls in 1982 showed Bradley ahead for governor of California, but he actually lost to Republican George Deukmejian. Pollster John Zogby (who correctly predicted Clinton's double-digit win Tuesday) said what practicing Democrats would not. "I think voters face-to-face are not willing to say they would oppose an African-American candidate," Zogby told me.The escape route from this dilemma only a few months ago seemingly was indicated...