Washington Post: The long-delayed Keystone XL oil pipeline cleared a major hurdle toward approval Friday, a serious blow to environmentalists' hopes that President Barack Obama will block the controversial project running more than 1,000 miles from Canada through the heart of the U.S. The State Department reported no major environmental objections to the proposed $7 billion pipeline, which has become a symbol of the political debate over climate change. Republicans and some oil- and gas-producing states in the U.S....