(CNN) -- Add another chapter to the illustrious history of freewheeling vice presidential debates. At Centre College in Kentucky, Joe Biden and Paul Ryan engaged in what might euphemistically be described as a lively exchange of ideas. In reality it felt more like a testy verbal brawl between father and son. Consider these key 5 moments from the debate. Ryan: No need to apologize This is a well played moment by Ryan, one of his best of the debate. He has a specific argument to make, and he fleshes out that argument clearly and logically. Ryan also delivers the material in an effective way. You can see his face become more animated as he speaks, and he uses simple rhetoric to express his doubts about the Obama administration's handling of the killing of the U.S. ambassador to Libya.
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Alan Schroeder: Debate's most striking feature was the age gap between candidates
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Schroeder: Biden managed to dominate the evening
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He says Ryan came across as not quite seasoned enough for the office he seeks
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Schroeder: Biden allows Obama to hit the reset button for his rematch with Romney
This represents an attempt by @placeholder to use humor to deflect a negative, in this case Romney's now-famous comment about the 47% of Americans who don't pay taxes.