Billionaire Diane Hendricks has injected $5.5 million into the Reform America Fund

The Reform America Fund has raised almost $5.9 million since it waslaunched in July 2015, meaning Hendricks accounts for 93 percent of its war chest.

Since mid-September, the super PAC has spent $3.4 million on ads critical of Democratic presidential nominee Hillary Clinton and another $2.2 million lambasting Democratic U.S. Senate candidate Russ Feingold, who’s in the midst of a rematch with incumbent Republican Sen. Ron Johnson.

According to data provided to the Center for Public Integrity by ad tracking firm Kantar Media/CMAG, the Reform America Fund has aired about 2,400 anti-Clinton ads in Wisconsin — accounting for roughly 55 percent of all presidential-focused ads in the state since the primaries ended.

No other group has been as big a player on the TV airwaves in Wisconsin in the presidential race.

On its website, the Reform America Fund says Clinton — a former secretary of state, U.S. senator and first lady — “simply can’t be trusted.”

It’s a message the super PAC has hit repeatedly in its TV and digital ads at a time when Clinton has been battling criticisms of potential pay-to-play politicking, foreign influence peddling and mishandling of classified emails.

“C is for Clinton, whose campaign is sliding,” a narrator states in one of the group’s ads. “And C’s for the classified emails she’s hiding.”

The theme of a second ad was “C is for cover-up.” While a third anti-Clinton spot accused Clinton of selling access to foreign governments as secretary of state.

A second website operated by the Refund American Fund allows people to share various “C is for Clinton” memes online.

Who’s behind it?

Hendricks, co-founder and chairman of ABC Supply, the largest wholesale distributor of roofing in the United States, is well known in GOP circles.

Before supporting Republican presidential nominee Donald Trump this year, she backed Wisconsin Gov. Scott Walker’s failed presidential campaign.

Hendricks donated $5 million to a super PAC that supported Walker — about one-fifth of the group’s overall receipts.

In May, Hendricks was named a vice chairwoman of the Trump Victory committee. Since then, she’s donated $212,700 to the joint fundraising group that benefits Trump’s campaign as well as the Republican National Committee and several state parties.

Among her other notable political contribution this election: Hendricks has donated $4 million to the Freedom Partners Action Fund, the super PAC backed by the conservative billionaire brothersCharles and David Koch of Koch Industries. And she gave $400,000 to the committee that hosted the Republican National Convention in Cleveland in July.

Money in

As a super PAC, the Reform America Fund may collect unlimited amounts of money from individuals, corporations and labor unions — so long as it doesn’t coordinate its spending with candidates’ own campaigns.

In addition to Hendricks, who also serves on Trump’s economic policy council, several other Midwestern business executives rank among Reform America Fund’s top donors.

Among them: FABCO Equipment CEO Jere Fabick, who’s given $150,000; TAMKO Building Products CEO David Humphreys, who’s given $100,000; and Uline CEO Richard Uihlein, who’s given $100,000.