First lady Michelle Obama gestures to the crowd at a Walmart Neighborhood Market in Springfield, Mo., Thursday, Feb. 28, 2013. Obama was promoting her campaign against childhood obesity

 

              First lady Michelle Obama gestures to the crowd at a Walmart Neighborhood Market in Springfield, Mo., Thursday, Feb. 28, 2013. Obama was promoting her campaign against childhood obesity
First lady Michelle Obama gestures to the crowd at a Walmart Neighborhood Market in Springfield, Mo., Thursday, Feb. 28, 2013. Obama was promoting her campaign against childhood obesity and highlight "the groundbreaking steps” the retailer has taken to make healthy food more affordable.(AP Photo/Orlin Wagner)