A group associated with billionaire conservative donors Charles and David Koch is launching a six-figure ad buy attacking North Dakota Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (D) for voting against the Republican tax overhaul.

The fiscally conservative group Americans For Prosperity (AFP) is putting about $450,000 behind the ad, which will begin running statewide through television and digital outlets beginning Wednesday.



“Heidi Heitkamp went to Washington and she promised to look out for us,” the ad's narrator states.

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“Instead, Heidi took hundreds of thousands from well-connected special interests, then gave special interests hundreds of thousands in handouts. Caribbean Rum distillers, Hollywood filmmakers, racehorse owners — they all cashed in. But when Heidi had the chance to help us with real tax cuts, she turned her back, voted no. Heidi Heitkamp — handouts for special interests, higher taxes for us.”

Heitkamp is one of 10 Senate Democrats seeking reelection this year in states that President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE carried in 2016. Trump took 63 percent of the vote in North Dakota, against only 27 percent for Democrat Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE.

The Democratic senator is expected to face Rep. Kevin Cramer Kevin John CramerMomentum growing among Republicans for Supreme Court vote before Election Day On Paycheck Protection Program, streamlined forgiveness is key McConnell shores up GOP support for coronavirus package MORE (R-N.D.) in the general election. There is very little polling of the race, but a February survey from Gravis Marketing found Heitkamp ahead by 3 points, 43 to 40 percent.

AFP recently launched an initiative called American Pay Raise in the 10 states with Democratic senators facing tough reelection bids. It includes a six-figure digital ad buy thanking lawmakers who supported the GOP tax bill that Trump signed into law in December.

No Democrats in the Senate voted in favor of the tax law.

The AFP ad buys are part of a broad offensive by the Koch network to sell the GOP tax law — and to attack the red-state Democrats who voted against it.

The tax bill was enormously unpopular at the time of its passage but recent polls show voters have warmed to the law since it went into effect.

The Koch Network has committed up to $20 million in advertising for the tax law. Since February, AFP has spent nearly $8 million in ads going after Sens. Joe Donnelly Joseph (Joe) Simon DonnellyNames to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day Barrett seen as a front-runner for Trump Supreme Court pick MORE (Ind.) and Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (Mo.), two Democrats who also are seeking reelection in states won by Trump.

The Koch Network will spend up to $400 million this cycle on politics and policy.

Allied groups have already put $1.6 million behind ads in Wisconsin attacking Sen. Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (D-Wis.) for her handling of a prescription drugs scandal at a local Veterans Affairs center.

On the policy front, the network is urging the White House to get behind a Democratic proposal to extend protections to those covered by the Obama-era Deferred Action for Childhood Arrivals program and is urging Congress to pass a bill allowing terminally ill patients to use experimental drugs. Prison reform and reducing recidivism rates among former prisoners is another top Koch priority.