Diddy managed to look particularly morose at Howard University in Washington, D.C., where he posed with fans, clutched a microphone, and leaned back with a pained expression. That sling looks pretty serious, but he assured us that it's from his shoulder surgery after overexercising. It's not the best time, especially since he's been so active convincing us to vote-- for people who don't "scare" him, that is!