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12-year-old NCAA bracket winner shows how he did it
Sam Holtz, a 12-year-old from Illinois, emerged at the very top of the ESPN bracket challenge, beating out more than 11 million other Americans. He joins Steve Kornacki to show how he did it.
Nina Turner: The black vote should be earned06:27
Clinton, Sanders in tight race in Iowa04:02
Rand Paul: Trump will make GOP 'lily-white'05:05
Flint water crisis deepens06:40
University of Iowa football team endorse Trump06:01
2016: How the digital ground game has changed06:47