It is not the first time al-Qaeda and its allies have weighed in on a Western election. Bin Laden released a video message Oct. 29, 2004, days before the U.S. presidential election, warning of plans for further attacks on U.S. targets. Some strategists for Sen. John F. Kerry (Mass.), the Democratic nominee, have said the timing of the message tipped the balance toward Bush, who defined himself as the anti-terrorism candidate.
The deadly train bombings in Spain that year were seen as an attempt by al-Qaeda to bring down then-Prime Minister José María Aznar, who had sent troops to Iraq. Aznar lost his reelection bid three days after the bombing.
Recent polls suggest that Iraq and terrorism are less important to most Americans than the economy. Still, terrorism experts have warned that al-Qaeda may indeed launch a major strike before the U.S. election or shortly afterward.
"The idea of testing a new president or hitting us when we're off-balance is enormously attractive to them," said Bruce Hoffman, a Georgetown University terrorism expert.
http://www.washingtonpost.com/wp-dyn/content/article/2008/10/21/AR2008102102477.html