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Tournament Challenge: 9.3 percent picked Duke to win it all

In the end, 9.3 percent of the 11.57 million Tournament Challenge brackets correctly picked the Duke Blue Devils to win the NCAA tournament. The Blue Devils were the third-most popular team to win it all at the beginning of the tournament, behind only the Kentucky Wildcats (48 percent) and Wisconsin Badgers (9.9 percent), the team they beat in the title game.

Here's how that number compared to recent champions:

2014: Connecticut Huskies -- picked to win in just 0.3 percent of brackets

2013: Louisville Cardinals -- 21.9 percent of brackets

2012: Kentucky -- 35.1 percent

2011: Connecticut -- 4.7 percent

2010: Duke -- 6.4 percent

President Obama's bracket: The President finished in the 39.5 percentile, with an overall record of 39-24, the same record he had last year (although he was in the 72.9 percentile then). He hit just one Final Four team in his national championship pick of Kentucky, which lost to Wisconsin in the national semifinals.

An all-chalk bracket, picking just the favorites, finished in the 62.2 percentile with a record of 44-19.