Mystery grips D.C. as ex-Speaker Hastert indicted : Gave Up CME Board Seat.

USA Today reports:

Hastert resigned on Thursday from the Washington lobbying firm Dickstein Shapiro, according to multiple news reports. Hastert also gave up his place on the board of directors of CME Group in Chicago, a spokesman for the futures exchanges confirmed on Thursday. Hastert had served on the CME board since 2008.

Hastert is the longest serving Republican speaker of the U.S. House, serving from January 1999 until Republicans lost the House in the 2006 elections.

He was often referred to as the "accidental speaker" for his unusual rise to power following the resignation of former Rep. Bob Livingston, R-La., who was poised to succeed Newt Gingrich in the post but bowed out after revelations of extramarital relations.

Stay tuned.