What about the myth that the pipeline represents an economic business decision? What might have seemed an economic choice 10 years ago is no longer economic - the ultimate cost of most of the oil to be delivered at the Gulf cannot compete in the global market. No currently available tar sands oil or bitumen is below breakeven price for Gulf delivery when its discount and transportation costs are considered, even after the subsidization they get from the Canadian government. The medium and long term breakeven sales price for this oil is extremely likely to exceed world market price. That means a pipeline that at best is way underutilized and in the extreme not used at all. See: http://worthingtonsawtelle.com/keystone-xl-run-numbers-bad-business-decision/
Let's face it, if TransCanada were smart it would realize its investment decision is no longer viable, halt this effort and send its oil south over rail when and if it were economic.
So why on earth are US politicians wasting so much time and energy to allow what amounts to a stupid business decision?