The annual Easter Egg Roll on the White House lawn has been a cherished tradition since 1878. A newer tradition that is equally beloved here in the White House is the annual poster contest, where children across the country are invited to interpret the year's theme, and send them here for Mrs. Obama to choose her favorites. This year's theme, which was inspired by the pillars of Let's Move!, is "Be Healthy, Be Active, Be You!" The deadline is next Tuesday, March 5. Click here to find out how your kids can enter the 2013 White House poster contest.