Barack Obama joined Jimmy Fallon and his house band The Roots last night, to make the case that the interest rates on subsidized student loans should remain low when they're re-evaluated by Congress this summer. Looking to re-energize young voters that came out for him in '08, Obama got big claps for speak-rapping that billionaires should be taxed before school gets more expensive, but Black Thought delivered the skit's punchline: The right and left should join on this/ Like Kim and Kanye. Watch Fallon's full interview with the President here.