Democratic U.S. Senate candidate Foster Campbell on Thursday picked up the endorsements of the Sierra Club and 22 of Louisiana’s best known environmentalists.

"We are confident that Foster Campbell will work to protect Louisiana families’ health, air and water, to build an energy economy that works for our state," said Woody Martin, chair of the Delta Chapter of the Sierra Club. The Sierra Club is the nation’s largest member-led environmental organization, with 2.4 million members, 4,000 of whom live in Louisiana.

Campbell, a member of the Louisiana Public Service Commission, is one two dozen candidates seeking to succeed Republican Sen. David Vitter, who is stepping down at the end of his term. The election is Nov. 8 with a runoff, if necessary, on Dec. 10.

As a state senator, Campbell sponsored legislation creating the Louisiana Black Bear and Bobwhite Quail license plates to fund preservation efforts, restricting billboards on Interstate 49, and giving incentives to landowners to protect wildlife.

Campbell said Thursday he has long backed the idea of suing oil companies for the damage created in seeking and producing oil and natural gas in the coastal marshes of south Louisiana. The state Legislature passed laws in 2014 that retroactively spiked such a lawsuit.

New Orleans writer John Barry, one of the chief instigators of the legal action, announced Thursday he was backing Campbell.

“Every politician talks a good game about it, but few have the courage to do something about it,” said Barry, author of “Rising Tide,” a book about the 1927 flood. “In this race Foster Campbell has proven he has the guts to do the right thing, and not just talk the right thing."

Barry is one of 22 environmentalists backing Campbell’s candidacy. The list includes Casey DeMoss, executive director of the Alliance for Affordable Energy; wildlife artist Don Edwards; and Marylee Orr, Baton Rouge, founder and executive director of the Louisiana Environmental Action Network.

Follow Mark Ballard on Twitter, @MarkBallardCnb.