Click here to watch "Two Bad For New Mexico."

Regardless of which Republican candidate wins the party nomination in the New Mexico Senate primary race, the environment will be in danger, asserts a new ad from advocacy group Defenders of Wildlife Action Fund.

"Two Bad For New Mexico" (subscription) uses a common metaphor to present New Mexico Reps. Steve Pearce and Heather Wilson as two sides of the same coin on environmental issues. "Heads: Wilson took $525,000 from Big Oil and gave them billions in tax breaks," the ad claims. "Tails: Pearce took $492,000 from Big Oil and voted against fuel efficiency."

This isn't the first time the group has bought airtime (subscription) to push a green agenda, and Defenders of Wildlife President Rodger Schlickeisen told AP last week that the organization plans to invest heavily in the New Mexico race. The group's endorsement has already been locked up by Democratic candidate Tom Udall, another New Mexico congressman, who is running unchallenged for his party's nomination.