New York's celebrity senator, Democrat Hillary Rodham Clinton, generates near-constant buzz about a possible 2008 presidential bid. The outgoing governor, Republican George Pataki, has been making campaign reconnaissance trips to Iowa, site of the first-in-the nation presidential caucuses. But for former New York City Mayor Rudolph Giuliani, the road to a possible presidential campaign has shaped up very differently. The man dubbed "America's Mayor" for his take-charge performance after the Sept. 11, 2001, terrorist attacks has been flying under the media radar, building his businesses and enjoying a prosperous private life while assessing his chances in a crowded and conservative...