It's North Carolina or nothing for President Barack Obama.

The president went 1-for-4 on Final Four teams in his NCAA tournament bracket, hitting with the Tar Heels but losing with Louisville on Sunday.

The split left Obama in the bottom 47 percent of the 5-plus million fans who entered ESPN.com's pool. After correctly choosing 14 teams to reach the round of 16, his bracket ranked in the top 40 percent.

Obama picked North Carolina to win the championship. The top-seeded Tar Heels reached the national semifinals by beating Oklahoma 72-60.

The president's bracket also had Louisville, Pittsburgh and Memphis making the Final Four.

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On the Web: http://games.espn.go.com/tcmen/entry?entryID