Energy: As a big Dem donor talks of pipeline terrorism, new federal reports warn that killing Keystone XL will overburden rail transport of oil and result in more frequent and deadlier environmental disasters. Environmentalists who claim that the Keystone pipeline from Canada represents an unprecedented environmental threat ignore that the pipeline would pose no greater danger than the more than 50,000 existing miles of safely operating pipeline already crisscrossing the U.S. They also ignore the very real and growing environmental danger in the only viable alternate for transporting oil — by rail. Keystone would not only carry oil from Canada...