Former Michigan Secretary of State Terri Lynn Land (R) has two new ads slamming Rep. Gary PetersGary Charles PetersJohn Lewis to miss Martin Luther King Jr. Day event Hillicon Valley: Trump turns up heat on Apple over gunman's phone | Mnuchin says Huawei won't be 'chess piece' in trade talks | Dems seek briefing on Iranian cyber threats | Buttigieg loses cyber chief Democrats sound election security alarm after Russia's Burisma hack MORE (D-Mich.) for opposing the Keystone XL pipeline and tie him to billionaire environmentalist Tom SteyerTom Fahr SteyerOn The Money — Presented by Wells Fargo — Senate approves Trump trade deal with Canada, Mexico | Senate Dems launch probe into Trump tax law regulations | Trump announces Fed nominees Steyer proposes cuts for low- and middle-income families' taxes Warren to Sanders: 'I think you called me a liar on national TV' MORE.

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"Steyer could make millions by stopping the Keystone pipeline, and Peters stood with Steyer, voted against energy independence, killing jobs, increasing oil and gas prices. Gary Peters: Working for billionaires, not Michigan," one of the ads says.

The ads mirror those Peters and his allies have run attacking Land for the support she's received from the billionaires Charles and David Koch's Americans for Prosperity.

The ads don't explain how Steyer could profit by blocking the pipeline, though one says he "could make millions by killing the pipeline from investments in Keystone's competitor."

Land's campaign says Steyer might be invested in natural gas or green energy products that could go up in value if Keystone is blocked.

A poll conducted for a pro-Keystone XL group released on Wednesday found Peters ahead in the race by 42 percent to 35 percent, though it also found that opposing Keystone could hurt him in the race.

— This post was updated at 12:37 p.m.