Candidates question university's invitation to Iran president

• Story Highlights
• President Ahmadinejad speaks at Columbia University campus after invitation
  
• GOP presidential candidate Rudy Giuliani calls visit "disturbing"
  
• Democrat Sen. Hillary Clinton says she would not have invited Ahmadinejad
  
• Mitt Romney says Ahmadinejad should not be allowed to speak at U.N.
  
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