When we elect leaders to represent us, most people probably expect that those leaders will conduct themselves morally. At this point, though — after centuries of presidential scandals and misbehavior — it's probably more logical to expect that those leaders will be doing things behind closed doors that we can't even imagine. The country loves a presidential affair rumor, the suggestion that someone we looked up to has behaved in a way that would make most people blush.

For example, Bill Clinton had a scandalous incident years before his Monica Lewinsky affair , but people were still shocked when that whole story broke in the public. Writer Peggy Noonan attended a National Prayer Breakfast led by the then-president, and she had to remind herself just who was speaking. "I thought: He's ta

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