The groups will also coordinate an 11-state field program to help turn out the vote for their candidates this fall.
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A coalition of environmental groups is launching a $5 million push to help their Senate allies and to fight back against attacks from Americans for Prosperity, the conservative group backed by the billionaire energy moguls Charles and David Koch.
The coalition, which includes the Sierra Club, the Environmental Defense Fund and the American Sustainable Business Council Action Fund, is airing ads touting the work Sen. Kay Hagan (D-N.C.) and Reps. Bruce Braley (D-Iowa) and Gary Peters (D-Mich.) have done to protect the environment.
All three are in tight Senate battles and have been the targets of millions of dollars in negative ads from Americans for Prosperity.