Americans for Prosperity, a group largely funded by the billionaire Koch brothers, confirmed Tuesday that it had bought airtime in Indianapolis and five other Indiana TV markets but canceled the buys just an hour later.

A source told RTV6's Norman Cox that the anti-Donnelly ads were canceled because of creative differences about the content, but that they will probably be remade and will air soon.

Democrats said the super PACS have set sights on Indiana because Donnelly is doing well and Republican opponent Richard Mourdock needs them.

"This is just a replay of the primary, where Richard Mourdock runs a weak campaign, can't articulate any reason why he needs to be elected, and he's getting bailed out by billionaire corporations and well-funded Republican donors to prop up his campaign," said Indiana Democratic Chairman Dan Parker. "It's pretty pathetic."

Indiana Republican Party spokesman Pete Seat shot back at Democrats saying the race is about the right track versus the wrong track and that no amount of deflection can hide the fact that Donnelly has represented the wrong track in Washington, D.C.

The Mourdock campaign, which legally can't have any connection to anti-Donnelly super PACs, had no comment on the AFP campaign.