It’s Monday afternoon on February 13, and just over an hour ago 350.org and a coalition of over 30 progressive groups, environmental campaigns, businesses, and blogs launched a 24-hour drive to send over 500,000 messages to the Senate opposing the Keystone XL tar sands pipeline. The timing is crucial: starting today, oil-soaked Republicans are going to be attempting to saddle a transportation bill with an amendment that would override President Obama’s decision to reject Keystone XL and push approval of the project.