According to Marc Ambinder,
The Federal Bureau of Investigation did not participate in the vetting of Gov. Sarah Palin and did not conduct a background check as part of the process, an FBI spokesman said today.
The Washington Post reported Sunday, citing an interview with campaign manager Rick Davis, that the vetting process "included reviews of financial and other personal data, an FBI background check and considerable discussion among the handful of McCain advisers involved in the deliberations.

"In general, we do not do vetting for political campaigns except as it might regard investigations needed for security clearances," said John Miller, the chief FBI spokesperson.

The FBI did not participate in a vet, nor did it run a background check of Gov. Palin as part of the process."

Extraordinary that the campaign thought  it could get away with this sort of falsehood.  But it says just as much about their sense of vulnerability that they'd try, does it not?