Mr McCain is at his best taking questions from unscreened voters, something most politicians seldom dare to do.

ECONOMIST: John McCain

Presidents felt relatively safe strolling onto a sidewalk with unscreened people in close proximity -- until Ronald Reagan walked onto the wrong sidewalk on the wrong day.

CNN: Barack Obama slept here

"Right now we do not have adequate measures of safety because 90 to 95 percent of those bags are unscreened in the belly of an airplane, " said Rep. Jay Inslee, D-Washington.

CNN: Congress mulls tightened security for checked baggage