Maybe Michelle and Barack Obama were strong-armed into having an organic garden on the White House lawn by tough punks like Alice Waters, but Secretary of Agriculture Tom Vilsack made his without any public opinion campaigns to twist his arm. Yep, there are two governement garden in DC, the second one run by the USDA itself.
On 1,250 square feet a few blocks from the Washington Mall, Vilsack and USDA employees have planted a "People's Garden", with the crops all going to local food banks. They've even created cooking projects around it. USDA pickles, anyone? Not for sale, though, because that would probably violate some regs.