All 24 'American Idol' winners ranked from least to most successful

Hannah Harper after winning season 24 of "American Idol." Eric McCandless/Disney/Getty Images "American Idol" concluded its 24th season on Monday. Some winners, such as new judge Carrie Underwood, have sold millions of records and won Grammys. We've ranked every winner's success, from Hannah Harper to Kelly Clarkson. Thousands of people have tried out for "American Idol" over the past 24 years, with the hope of becoming America's next biggest pop star. But how many of the 24 winners have ac...