New York Times: President Obama faces a knotty decision in whether to approve the much-delayed Keystone oil pipeline: a choice between alienating environmental advocates who overwhelmingly supported his candidacy or causing a deep and perhaps lasting rift with Canada. Canada, the United States most important trading partner and a close ally on Iran and Afghanistan, is counting on the pipeline to propel more growth in its oil patch, a vital engine for its economy. Its leaders have made it clear that an American...