Conn Carroll, DC Examiner
President Obama has surged ahead of Mitt Romney nationally and in a slew of important swing states since the Democratic National Convention. His current 4 point lead over Romney in the Real Clear Politics poll average is his biggest since depths of the Republican primary this April.But what is driving this Obama resurgence? Are Republicans losing faith? Are independents leaning to Obama? Nope. Obama's entire bounce seems to be coming entirely from a surge in Democratic enthusiasm. Gallup, who currently shows a six point Obama lead, reports: "Voter enthusiasm in [swing] states...