Joe Biden is just being Joe, and this kind of edginess often works
Down-home and laid-back, Joe Biden has been traveling the USA saying, for better or worse, what few politicians would say about their opponents. Biden has a long history of edgy verbal hurts. But since his blustery vice-presidential debate with Paul Ryan, he seems to have found a slightly different niche, a more deliberate delivery of his sometimes-outrageous utterances. He offers these with a smile, relishing the stage, often punctuated by a “Whoa!”
Within the Obama campaign, there is a cautious fear that Biden will go too far. But Biden fills a strategic role for the campaign: to attack relentlessly and to be full-throated in defense of the Obama administration. This is straight out of the VP 101 class. And, because of his ability to connect and communicate in a clear and effective way, Obama’s campaign officials have decided to let Joe be Joe.
Biden has twice run for president and has not ruled out a third attempt in 2016.
Source : http://www.washingtonpost.com/politics/decision2012/joe-biden-is-just-being-joe-and-the-edginess-works-for-some/2012/10/19/022d0726-19fb-11e2-94aa-9240e72ee00b_story.html?hpid=z1