Michelle Obama was in Chicago Tuesday to promote her “Let’s Move!” campaign for healthy eating and exercise. Rahm Emanuel played host to the First Lady in her visit to a South Side Walgreens that now stocks fresh produce and grocery staples—and then at Growing Power’s Iron Street Urban Farm. The two, plus a few urban mayors (Milwaukee’s Tom Barrett and Baltimore’s Stephanie Rawlings-Blake, to name two), addressed the important subject of food deserts and access to healthy food in cities.