CNN  —  Several political lifetimes ago, Barack Obama followed Bruce Springsteen onstage at a huge rally beneath the Cleveland skyline and declared, “A rising is coming.” That promise, riffing off one of the rock icon’s hits, came true days later, when Obama won the 2008 presidential election. The band was back together Thursday night , in Georgia. The former president, now 63 and still the Democratic Party’s most compelling figure, and the Boss were trying to push Democratic nominee Kamala