Boxing legend Muhammad Ali has become the first athlete to receive the prestigious Liberty Award in the US. It's for his work outside the ring as a social activist. Ali also received $100,000 in cash prize. But there was a time when he was wildly vilified including the time when he dropped his old name Cassius Clay and converted to Islam. Today, however, Ali, who at 70 is suffering from Parkinson's disease, is one of the most beloved and idolized athletes in the world. Al Jazeera's Cath Turner reports from Philadelphia.