Why Bill Clinton's Speeches Succeed: Because he treats listeners as if they are smart.
The main other place you hear discussion based on the same assumption that people of any background, education level, or funny-sounding accent can understand sophisticated back-and-forth of argument and counter-claim is sports-talk radio. ("I understand the concern about Strasburg's arm. But ... ") You hear insults and disagreements and put-downs on sports-talk discussions. You rarely hear the kind of deliberate condescension, the unconcealable effort as if talking to slow learners, of many political "authorities" addressing the unwashed.
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Different people have different natural modes for their speech, and not many people can pull it off just the way Clinton does. But Clinton reminds us of the value (and rarity) of this tone in politics -- and the next time you listen to a sports-talk channel, think how much better our political discussion would be if participants assumed as much sophistication about argument as ESPN and radio-talk hosts do.