Detroit artist Richard Phillips, who will turn 73 next month, is having his first exhibition. He is America's most unlikely art phenom, because before becoming celebrated, Phillips was incarcerated for 46 years for a murder he didn’t commit, until he was exonerated last March. Now, with nothing but prison time on his resume, he thought perhaps he could sell his life's work - hundreds and hundreds of watercolors he painted while in prison. Steve Hartman reports.