Guardian: Barack Obama reversed a planned expansion of offshore drilling today, admitting he had been wrong to believe that oil companies were prepared to deal with a catastrophic oil spill. He told a White House press conference he was ordering a six-month freeze on the opening up of the remote waters of the Arctic to oil exploration and on the drilling of 33 deepwater wells in the Gulf of Mexico. Proposed lease sales off the coast of Virginia and in the western Gulf would also be …