Sen. Bernie Sanders, I-Vt., has given U.S. financial firms another reason to move abroad by leaking confidential trading information about crude oil positions in 2008, this editorial argues. "Ol' Bernie may think posting confidential trading data is a political winner amid high energy prices, but his stunt has costs," The Wall Street Journal argues. "... If U.S. regulators can't be trusted to keep private investment data under wraps, businesses have one more reason to do their derivatives trading elsewhere." FIA's John Damgard has urged the Commodity Futures Trading Commission to investigate the disclosure. Read FIA's letter to the CFTC.