Obama says he is practicing a new kind of politics, but why has his PAC sloshed $698,000 to the campaigns of the superdelegates, according to the Center for Responsive Politics?

• 奥巴马宣称他实施的是一种新的政治观念。但为什么据美国政治回应中心讲，奥巴马让他的政治行动委员会在游说“超级代表”方面投入了多达698，000美元的费用？