** FILE ** The Senate investigations subcommittee's ranking Republican, Sen. Tom Coburn, questions a witness on Capitol Hill in Washington on Tuesday, April 27, 2010, during the subcommittee's hearing on Goldman Sachs and the financial crisis. (AP Photo/Susan Walsh)

** FILE ** The Senate investigations subcommittee's ranking Republican, Sen. Tom Coburn, questions a witness on Capitol Hill in Washington on Tuesday, April 27, 2010, during the subcommittee's hearing on Goldman Sachs and the financial crisis. (AP Photo/Susan Walsh)