Tarsands is not oil, is worse for the environment than oil, and will cost more to refine. There is no guarantee the US will enjoy benefits from using tarsands 'oil' instead of oil from the Middle East. TransCanada has had 11 spill accidents in 1 year on a new pipeline using the same technology planned for KXL. Canada does not want a pipeline to deliver tarsands to their West Coast! Why would we want it to cross 6 US states and 2000 miles. A tarsands spill in Kalamazoo, Michigan has left the river unusable for drinking water after a year, and 300 hundred families were forced to leave their homes near the river. The longterm effects on health of tarsands exposure are unknown.
Seven thousand of the jobs 'associated' with KXL are jobs that produced the pipeline KXL will use, already purchased from South Korea. TransCanada admits onlly 6500 construction jobs of 2 years duration will be created for the project. 'Spin-off' jobs are over-estimated based on the number of jobs created by the Alaska pipeline, which created many jobs as a result of being built in an isolated area with few existing services available. We cannot expect the same number of new 'spin-off' jobs for KXL!
We should leave this muck in the ground, and focus on clean, renewable energy sources. Abandon the KXL project!