Even with Canada having a 'conservative' Prime Minister (by their standards) they are still waaaay more Liberal as a nation than is the USA. But they support the K-pipeline and that gives me pause, as an environmentalist, to oppose it. Labor Unions in the USA have helped the working person daily for decades and they support the K-Pipeline. They are not 'evil rich guys'.
Also, as an environmentalist, I have to weigh the potential damage from an underground pipeline leak, against the tremendous air pollution caused by trucks transporting this oil. There are no greenhouse gasses released by a pipeline leak and there are, as we speak, tremendous amounts of CO2, being pumped into our atmosphere by trucks transporting this oil and that will go on if the pipeline is stopped. And too, the odds of tragic violent death caused by an oil transporting truck or train are very high, compared to the pipeline.
I am against the Koch Brothers political aspirations on every 'social' issue, but I recognize that they do make their money within our laws and I cannot join in on the idea that it is a good thing to oppose any project that will lead to profits for them, simply for that reason.
I cannot say for sure what is best for us right now on this issue. But I can say that I trust President Obama, our Labor Unions, the EPA studies and the leadership of the Canadian government to make the best decision on this issue.