First lady Michelle Obama at a Walmart Neighborhood Market in Springfield, Mo., Thursday, Feb. 28, 2013. Obama was promoting her campaign against childhood obesity and highlight "the gr

 

              First lady Michelle Obama at a Walmart Neighborhood Market in Springfield, Mo., Thursday, Feb. 28, 2013. Obama was promoting her campaign against childhood obesity and highlight "the gr
First lady Michelle Obama 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)