Evening News Online, 03.13.12

      |Tuesday: The Republicans fight for the heart of the South - CBS News projects Rick Santorum will win the Alabama primary, but it's a close three-way race in Mississippi; Also, new information sheds light on the massacre in Afghanistan and the president vows a full investigation; And, Bryon Pitts reports on how a poster child for America's obesity epidemic became a model for turning it around.

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