(CNN) -- Gov. Sarah Palin on Wednesday said Sen. Barack Obama has ties to a Columbia University professor who she said is "a former spokesperson for the Palestinian Liberation Organization."
The Obama campaign said on its Web site that "ugly insinuations about Barack Obama's relationship with a former neighbor and university colleague ... are completely false." The professor has denied he was a spokesman for the Palestine Liberation Organization, which the U.S. and Israel consider a terrorist organization.
Palin said her assertion "is not negative campaigning to call someone out on their record."
"It seems that there is yet another radical professor from the neighborhood who spent a lot of time with Barack Obama going back several years," Palin said at an event in Bowling Green, Ohio.