Hip-hop artist and autotune aficionado T-Pain is not super impressed with the president's singing ability. "Probably 50/50," he assessed at Saturday night's OurTime.org Generation Now party being held at the National Portrait Gallery. So perhaps autotuning would help? "Oh definitely, all the way, crank it all the way up," he laughed. T-Pain was joined on the red carpet by Common, will.i.am and then later, at the party, by John Legend. In preparing an inaugural party setlist, T-Pain had one thing in mind. "A lot of clean stuff," the rapper laughed.