McCain campaign calls Palin affair 'vicious lie'

John McCain's campaign is denying a tabloid report that vice president candidate Sarah Palin had an extramarital affair. "It's a vicious lie," spokesman Steve Schmidt said.

The campaign is considering legal action, the senior adviser added.

The National Enquirer wrote in its edition dated Sept. 15 that Palin had an affair with a business associate of her husband, Todd Palin. He …