Bloomberg: TransCanada Corp. (TRP)s proposed Keystone XL pipeline is losing popular support in Canada, a development that could embolden opponents of the project, according to a poll released today by Nanos Research Group. Canadian support for the $5.4 billion link between Albertas oil sands and U.S. Gulf Coast refineries has declined to 52 percent in December from 68 percent in April, while opposition has increased to 40 percent from 28 percent. The survey of 1,000 Canadians taken between Dec. 14 and Dec....