According to Rush Limbaugh today, "because he can beat Hillary".
Which is also, according to Rush, why they are laying off Mike Huckabee.
So as I say, Rudy's claim that he is the only one that beat Hillary Rodham Clinton for a run at the Oval Office (presumably because of his 9/11-based celebrity status) is a myth and lie. My claim is closer to the truth: a Republican Presidential candidate's inability to defeat this woman is an unusual exception; "any Republican candidate can beat Hillary if we unite behind him (and we will)."
Which logically leads to Rush's second claim regarding the ("Mainstream") media: that they are attempting to divide us and our (right-wing) voter coalition(s).