George Washington, Abraham Lincoln, Thomas Jefferson, Theodore Roosevelt and . . . Barack Obama? Patriotic tourists visiting the Mount Rushmore National Memorial in South Dakota on Wednesday found a fifth face displayed -- and not as a compliment -- next to the giant stone carvings of four legendary presidents. A group of environmental activists connected with Greenpeace unfurled an enormous banner showing President Obama's face and calling for an end to global warming. The 65-foot by 35-foot banner — which read "America Honors Leaders, Not Politicians: Stop Global Warming" — was hung to the immediate right of Lincoln at about...