Reuters: More oil than previously thought may have leaked into Lake Michigan this week from BP Plc's Indiana refinery, the company said on Thursday, after two U.S. Senators requested a meeting with the British oil major. The request from Senators Mark Kirk, a Republican and Dick Durbin, a Democrat, both from Illinois, came before BP issued its estimate that between 15 and 39 barrels of oil had spilled - more than an earlier assessment that nine to 18 barrels leaked on Monday. The Senators asked for details...