A major environmental group is launching television advertisements in Iowa and New Hampshire to promote Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE’s green credentials.

The ads from Friends of the Earth Action will begin airing next week in Iowa in advance of the Feb. 1 caucuses, the first votes of the presidential race, and then run in New Hampshire before its primary election.

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Though Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE, the front-runner for the Democratic nomination, is not mentioned by name, the ads implicitly contrast her policy positions with Sanders's.

“Bernie Sanders had the courage to stand up against the Keystone pipeline from day one. He introduced the bill to keep fossil fuels in the ground on federal land and he opposes unjust trade agreements that damage our planet,” the narrator says. “It is why Friends of the Earth Action urges you to support Bernie Sanders for president.”

The group endorsed Sanders on Aug. 1, the first major endorsement by a green group in the Democratic race.

The League of Conservation Voters Action Fund, another major player in campaign funding, has lined up behind Clinton.

Clinton declined to endorse or reject Keystone XL until shortly before President Obama’s November action denying a permit for its construction. Her delay was a sore point among members of the environmental movement.