Hill: A senior Democrat is pushing back against the presidential panel investigating the BP oil spill over its initial finding that BP and other companies involved in the disaster did not make decisions that sacrificed safety to trim costs. “What is fully evident, from BP’s pipeline spill in Alaska and the Texas City refinery disaster, to the Deepwater Horizon well failure, is that BP has a long and sordid history of cutting costs and pushing the limits in search of higher profits,” said Rep. Ed Markey…