"In 1970, a Senator from Wisconsin named Gaylord Nelson raised his voice and called on every American to take action on behalf of the environment," reads President Obama's Earth Day proclamation. "In the four decades since, millions of Americans have heeded that call and joined together to protect the planet we share." Well, I've got news for our president. Millions of Americans who had never heard of Gaylord Nelson "took action on behalf of the environment," decades before the good senator "raised his voice." More newsworthy still, most of these belonged to those insufferable rustics who "cling to guns and...