Reuters: The Obama administration heads to court on Thursday with a single goal — to reinstate a six-month moratorium on deepwater oil drilling imposed in response to the BP Plc oil spill but blocked by a federal judge. The high-stakes showdown starts at 3 p.m. local time (4 p.m. ET) at the U.S. Court of Appeals for the Fifth Circuit in New Orleans, where government lawyers will square off for one hour against drilling companies before a three-judge panel. The Obama administration said …