'Rudy Giuliani's experience on Sept. 11 and at ground zero propelled him into presidential politics, yet by his own admission, it may also weaken his health - a key issue for any candidate seeking the White House.
Just last week, Giuliani was criticized by some firefighter unions for suggesting he was at ground zero as much, if not more, than many rescue workers and exposed to the same health risks. He quickly backed off that statement, saying he misspoke.'
