Washington -- Dan Lungren, a Republican member of Congress from Sacramento County, wants to give the world "a second Yosemite Valley." The valley already exists, in Yosemite National Park - buried under 300 feet of water in the Hetch Hetchy Reservoir, which provides San Franciscans and 1.7 million other Bay Area residents with pristine water straight from the Sierra. All that would be needed would be to blow up the dam, which Yosemite godfather John Muir fought to his dying breath in 1914. The Schwarzenegger administration in 2006 estimated the cost at $3 billion to $10 billion. Lungren said Yosemite...