The WaPo reports:
An environmentalist billionaire is putting another half-million dollars into the effort to beat Attorney General Ken Cuccinelli II, the latest sign that outside groups plan to pour cash into the Virginia governor’s contest.
Tom Steyer — a San Francisco-based financier who previously put $400,000 behind an ad attacking Cuccinelli for his legal efforts against then-University of Virginia climate researcher Michael Mann — is upping the stakes. NextGen Climate Action Committee, a super PAC bankrolled by Steyer, is putting roughly $500,000 into a new ad that makes a broad attack on the ethics of Cuccinelli, who is squaring off against businessman Terry McAuliffe (D).