Correspondents' dinner attack
An expert says he "was perplexed even before the incident" about security at the correspondents' dinner.
Expert says he was perplexed at security for White House Correspondents' Dinner, says ID "not checked at any point"
Aaron MacLean, a CBS News national security analyst who attended the White House Correspondents' Dinner, said he "was perplexed even before the incident" about security for the event.


