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They said most of the group’s donations come from small, individual donors who give roughly $80 each and that maintaining the million-dollar donor’s anonymity was part of the deal.

“Why take the money?” Mr. Meckler asked. “People are entitled to do that, and we’re allowed to accept.”

Showing some of the tensions in the many-headed tea party movement, Mr. Meckler took a swipe at the Tea Party Express, another major group in the movement whose funding was widely credited in helping fuel upsets by fiscal conservative challengers in the Alaska and Delaware GOP Senate primaries.

The Tea Party Express, a group formed by longtime California GOP consultant Sal Russo, has raised more than $5 million and financed about $2 million in advertising to help candidates, according to the Associated Press.

“We’re going to favor the candidates we supported in the primary,” Mr. Russo told the AP. “But we’re not limited to that. We’ll try to help make a difference.”

But Mr. Meckler dismissed the Tea Party Express and other tea party activist groups as “fake.”

“Our offices are where we find a place to plug our laptops into the wall,” Mr. Meckler said. He said his group is not run by “a small elite leadership team based out of a Republican consulting firm in Sacramento. We’re the opposite of that.”