The last three races for governor combined -- 2002, 2006 and 2010 -- cost about $76 million. The peak came in 2006, when the contest between then-Gov. Robert L. Ehrlich Jr. and challenger Martin O'Malley cost $35 million. Their 2010 rematch cost about $22 million, while the 2002 contest between Ehrlich and Lt. Gov. Kathleen Kennedy Townsend came in about $19 million.