President Obama’s politically-motivated decision to turn down the Keystone XL pipeline probably shouldn’t have been a surprise, but it’s informative to learn how the president weighs an economic no-brainer versus a political opportunity.  With stubbornly high oil prices and unemployment, his refusal to grant approval for Keystone is easily an embarrassment to our national energy policy.  With the progressive green wing already in his camp, it’s a speculative move, at best.  Lesson learned: a small probability of political self-promotion trumps the national interest – and the