The recent news about John Edwards places him in a long line of politicians, religious leaders and celebrities who have succumbed to the natural sexual tendencies of the human male; there is no reason to believe that marital infidelity is any less common in the general population and divorce rates reflect that reality. The effort to encourage and enforce monogamy, the key ingredient of a family-based society, has always met with limited success.
It is ironic that some of these same politicians and religious leaders are such staunch opponents of gay marriage. Homosexuality, an inborn trait of an estimated ten percent of humans, has long been derided as a "sinful and irresponsible lifestyle" which promotes casual sex and promiscuity. One would think that these pious protectors of society would thus welcome the committed relationships that gay marriage is bound to encourage. Rather, entrenched in their "principles," these outwardly loyal men oppose legislation to sanction these unions. It is the epitome of hypocrisy (just ask their mistresses!).