Do you remember 9/11? It seems Rudy Giuliani doesn't. In the wake of the failed "underwear bomber", Rudy has claimed that "We had no domestic attacks under Bush; we've had one under Obama."
This requires forgetting not only 9/11 -- for Giuliani, a remarkable feat -- but the anthrax attacks and the shoe bomber.
I can only see two options: 1) Giuliani is so blinded by hatred for Obama that he's come down with hysterical amnesia and believes what he's saying, or 2) Giuliani is deliberately lying but has such a low opinion of the American voter that he thinks the lie will stick in some people's minds.
A similar malady seems to be effecting Dana Perino, who actually said "We did not have a terrorist attack on our country during President Bush's term," and Mary Matalin, who claimed that 9/11 was a problem inherited from the Clinton administration. (To refresh your memory, it was not the Clinton administration that, in August 2001, received and ignored a memo titled "Bin Ladin Determined to Strike in US".)