Vice President Joe Biden and Republican vice presidential nominee Rep. Paul Ryan, of Wisconsin, participate in the vice presidential debate at Centre College, Thursday, in Danville, Ky. (AP Photo/Charlie Neibergall)

Thursday’s vice-presidential slugfest has quickly become a debate about Vice President Joseph R. Biden Jr.’s grin. Mr. Biden’s smirking, emotional and aggressively sharp approach toward his rival, Representative Paul D. Ryan, prompted cheers from Democrats who had been desperate for the kind of in-your-face political rumble that President Obama did not deliver during his debate with Mitt Romney a week ago. But Mr. Biden repeatedly mocked and interrupted Mr. Ryan in ways that led Republicans to use words like “unhinged” and “buffoon” and “disrespectful” in the hours after the fast-paced, 90-minute exchange ended. The question by Friday morning: Did Mr. Biden go too far?/Michael D. Sheer, New York Times. More here.

Question: Did Biden go too far?