That same month, the Treasury Inspector General for Tax Administration issued another audit. The IG reported that the agency had also used shortcuts over nine years to select for examination liberal-oriented groups that focused on such topics as “medical marijuana” and “green energy.”Though fewer progressive groups received additional attention than tea party groups, Democrats said the IG report provided evidence that the scrutiny was not motivated by ideology.

“After years of baseless claims and false accusations it is my hope Republicans will finally put an end to this witch hunt and admit that their attacks on the IRS were nothing but political grandstanding on behalf of special interests at the expense of American taxpayers,” Sen. Ron Wyden (D-Ore.) said in a statement in October.

In interviews and an email exchange with The Post, Mitchell said the investigations failed to highlight the essence of IRS wrongdoing. She maintains the scandal was grounded in abusive, politically motivated targeting, as chronicled by the Issa report in 2014.

“I have no intention of ‘schooling’ anyone on why the IRS / Obama / Democrats’ narrative is wrong,” she wrote. “I’m not going to get into an argument to try to convince you of why that narrative is wrong. It just is. You either believe it or you don’t and if you don’t think there was a Political targeting scandal, then you don’t need to talk to me.”

Miriam Galston, a law professor at George Washington University, said there’s growing evidence that many charities are “flagrantly violating” the expectation that they contribute to “the public good.” She said IRS regulators are not in a position to do anything about it.

“They’ve been burned. They’ve been hammered. They’ve been bludgeoned,” said Galston, a specialist in state and federal nonprofit law. “They’re trying to survive.”

Database editor Steven Rich contributed to this report.

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