great list! hey, as long as Michael Pollan is proposing a farmer in chief, why not a poet in chief? or at least a holy fool to tumble around the white house lawn?
here are a couple more.

“Give me silnce, water, hope./Give me struggle, iron, volcanoes.” -Neruda, “Canto General” (toward the end)

“the true civilization will be the harmony of men with the land and of men among each other” -this one I don’t know. it was painted on a banner over a revolution scene in a Diego Rivera mural