Politico: President Barack Obama basked in applause Tuesday as he announced what sounded like a daunting environmental threshold for the controversial Keystone XL oil pipeline -- that the project can't go forward if it would "significantly' increase greenhouse gas emissions. What he didn't mention: His own State Department has already indicated that the pipeline can meet that standard. The State Department still hasn't issued its final environmental study on the pipeline, and the EPA has joined green activists...