According the National Enquirer, Sarah Palin has had an affair with her husband’s business partner.  This from an Enquirer Spokesman:

The National Enquirer’s coverage of a vicious war within Sarah Palin’s extended family includes several newsworthy revelations, including the resulting incredible charge of an affair plus details of family strife when the Governor’s daughter revealed her pregnancy. Following our John Edwards’ exclusives, our political reporting has obviously proven to be more detail-oriented than the McCain campaign’s vetting process. Despite the McCain camp’s attempts to control press coverage they find unfavorable, The Enquirer will continue to pursue news on both sides of the political spectrum

The McCain camp had threatened to sue.