HOUSTON — The liberal super PAC American Bridge is launching a $50 million effort in four swing states to flip rural working-class voters who voted for President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

American Bridge plans to spend millions on polling and research in swing counties in Wisconsin, Pennsylvania, Michigan and Florida to identify individuals most likely to defect from Trump.

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The super PAC will release “hyperlocal” ads in the coming weeks featuring personal stories from rural individuals who voted for the president in 2016 explaining Trump has let them down and why they will not vote for him again in 2020.

The goal, according to American Bridge Vice President Shripal Shah, is to create a “permission structure” for former Trump voters to come around to Democrats or to stay home on Election Day.

American Bridge has teamed up with the liberal data and analytics group Blue Labs on the effort, which will focus on voters in the counties that voted for President Obama in 2012 and Trump in 2016.

Shah said American Bridge’s polling finds Trump’s approval rating is deep underwater on key issues pertaining to the economy, trade and health care, and that the voters who propelled Trump to narrow victories in the Midwest and Rust Belt in 2016 are frustrated and looking for a reason to stay home or vote for Democrats on Election Day.

“We will 100 percent be focused on cutting into Trump’s support with rural working-class voters,” said Shah. “Over the course of this summer found a remarkable amount of opportunities. This will be unlike any paid media campaign before, it will be hyperlocal, authentic storytelling that highlights local voices to create a permission structure for Trump 2016 voters to flip back to our side in 2020.”

Michigan, Pennsylvania and Wisconsin went red in the 2016 election for the first time in decades, and Democrats believe that rebuilding that “blue wall” represents their best path back to the White House.

Trump carried those states only narrowly over Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE, fueled in part by his ability to run up margins with white working-class voters.

If the entire Electoral College map stays the same but Democrats can win back Wisconsin, Pennsylvania and Michigan, they will win back the White House.

A Change Research survey released this week sponsored by two Democratic groups found Trump’s job approval rating in rural areas of the Rust Belt and Great Plains states is at 60 percent, markedly higher than his job approval rating nationally.

Trump is most popular in Pennsylvania, where he hit the 60 percent favorability mark. He scored lowest in Michigan and Wisconsin, where his favorability rating is at 51 percent.