NEW YORK, Dec. 18 -- His national poll numbers are a dream, he's a major box office draw on the Republican Party circuit, and he goes by the shorthand title "America's Mayor." All of which has former New York mayor Rudolph W. Giuliani convinced he just might become America's president in 2008. He is showing the early signs of a serious candidacy: Giuliani's presidential exploratory committee throws its first major fundraiser in a hotel near Times Square on Tuesday evening, and he recently hired the political director of the Republican National Committee during 2006. A Washington Post-ABC News poll released...