San Francisco's City Hall,with the Victory Garden in foreground.Another way to lead the country: A garden on the White House Lawn? It could happen, if the next president decides to listen to writer Michael Pollan. Just in case you missed it, here is Pollan's terrific open letter to the man who will be not just the head of the country but our Farmer in Chief, reluctantly or not. For a small reality check, read this update from San Francisco on the security costs of protecting just such a garden--planted by Slow Food nation in front of City Hall. It's beautiful, but it has a price. Maybe it could be considered a test run.