Former New York Mayor Rudy Giuliani has entered the presidential race with a head of steam thanks to a remarkably positive public image among most Americans due to his performance in the wake of Sept. 11. But his opponents say Giuliani will eventually be weighed down as GOP voters take a more comprehensive look at his record and character – and operatives for rival campaigns are making plans to give Giuliani a proper introduction to rough-and-tumble national politics Soon, Giuliani opponents say, it will be Rudy’s turn. “On the national stage people know him for two things right now –...