Did Palin have affair with husband's business partner?

I've never bought a copy of The National Enquirer in my life because they are just not a reliable news source. However, they did nail John Edwards' affair. Could they have another scoop?

No less than three members of the man’s family including one by sworn affidavit have claimed that Sarah Palin engaged in an extramarital affair with hus­band Todd’s former business partner, Brad Hanson.

I report. You decide.