In 2004, then-Sen. John Kerry headed into the final weekend of the campaign feeling good about his chances of ousting Bush. That's when Osama bin Laden weighed in. Kerry believes the al-Qaida leader cost him the presidency by issuing a videotape that criticized Bush and warned U.S. voters that "your security is in your own hands" in the election.
"It changed the entire dynamic of the last five days," Kerry said later. "We saw the polls freeze and then we saw them drop a point, because all the security moms, it agitated people over 9/11."
