"Vote Or Die!" - those were the words Sean Combs, aka P Diddy, used on a t-shirt to get Philadelphia to vote today. The R&B singer was also joined by hip hop mogul Jay-Z, Mary J. Blige and wife Beyonce Knowles (who wore a hat with the word 'change'). Hundreds of people gathered to see the stars take to the stage, waiting for a chance autograph or a photograph.