The DVDs, 28 million in all, were a boost to Republican candidates who were trying to paint Democrats as weak on terrorism — and they arguably helped fuel the anti-Muslim sentiment that boiled over in the “ground zero mosque” fight last summer. The film, “Obsession: Radical Islam’s War With the West,” was widely criticized for its cartoonish portrayal of Muslims as modern-day Nazis.

But who put up the money to send out all those millions of DVDs?

Clarion, which has strong links to the right-wing Israeli group Aish HaTorah and is listed in government records as a foreign nonprofit, would never say.

Indeed, the group does not have to release detailed donor information because of its nonprofit tax status. We knew only that there was serious money behind the effort: Clarion spent nearly $19 million in 2008, the year it sent out the DVDs.

Now, just as Clarion is gearing up to release a new film hyping the threat of Iran, the money mystery has deepened: According to a document submitted to the IRS by Clarion and obtained by Salon, a donor listed as Barry Seid gave Clarion nearly $17 million in 2008, which would have paid for virtually the entire “Obsession” DVD campaign.

Nonprofit groups must submit financial information including the identity of donors to the IRS — but ordinarily only basic revenue and spending data are made available to the public. In the case of Clarion, an extra page with donor information seems to have been inadvertently included in its public filing. See it here. (It was previously available on public websites that collect IRS forms submitted by nonprofits.)

There’s only one Barry Seid Salon could find who might fit the profile of a $17 million donor to Clarion. That would be businessman Barre Seid (note the different spelling) of Illinois, a longtime contributor to right-wing and Jewish causes. But his representative flatly denied to Salon that he has ever given money to Clarion.

The elderly and press-shy Seid is president of Tripp Lite, a large Chicago-based manufacturer of power strips that got into the personal computer market on the ground floor back in the 1980s. Seid has personally poured millions of dollars into Republican campaigns and conservative causes, and his foundation has given generously to the Cato Institute, the Americans for Limited Government Foundation, and the David Horowitz Freedom Center. This year, Seid received an honorary degree from Bar-Ilan University outside Tel Aviv for his work “supporting those organizations which will fortify Israel’s position in the world.”