John McCain's presidential campaign has strongly denied an extramarital affair that the National Enquirer has alleged that Sarah Palin had with her husband's business partner.
Generally speaking, the National Enquirer has a poor record of accuracy, but did score a major coup in its coverage of John Edwards' extramarital affair, a story which Edwards' initially denied as false. The Edwards affair story sparked massive coverage in the mainstream media, and especially in right wing media outlets, who gloried in Edwards' fall from grace.
Now the McCain campaign appears to be on a collision course with the National Enquirer, promising a lawsuit if the tabloid proceeds with the story. For its part, the National Enquirer has promised a fuller treatment of the story in next week's edition of the grocery store checkout line staple.
A few weeks ago this story would have been dismissed out of hand, but since breaking the Edwards' story, the Enquirer has acquired just a whisker of credibility. It will be interesting to see how this plays out.