The New York Times covers a casualty of internecine Republican warfare, Jamestown Associates, a political advertising firm. Jamestown has drawn the ire of some establishment Republicans over its work for the Senate Conservatives Fund, which is backing primary challenges to Republican lawmakers whom it sees as insufficiently conservative.

The National Republican Senatorial Committee told Jamestown it will not need its services, and has been calling around to campaigns advising them not to use the firm either. “We’re not going to do business with people who profit off of attacking Republicans,” Brad Dayspring, a spokesman for the committee, told the Times. “Purity for profit is a disease that threatens the Republican Party.”

The Times notes a Jamestown connection to the Republican Jewish Coalition:

Mr. McConnell’s allies in Washington’s lobbying community have been furious for weeks that Jamestown, which also does work for groups like the Republican Jewish Coalition, was on retainer with the Senate Conservatives Fund.

The Senate Conservatives Fund is trying to unseat Sen. Mitch McConnell (R-Ky.), the GOP minority leader in the Senate, and other incumbents.

Incidentally, Dayspring’s last boss was Rep. Eric Cantor (R-Va.), the House majority leader and the only Republican Jew in Congress, who maintains a warm relationship with the RJC.

I’ve asked the RJC for comment and will update.

Ron Kampeas is JTA’s Washington bureau chief, responsible for coordinating coverage in the U.S. capital and analyzing political developments that affect the Jewish world. He comes to JTA from The Associated Press, where he worked for more than a decade in its bureaus in Jerusalem, New York, London and, most recently, Washington. He has reported from Northern Ireland, Afghanistan, Bosnia and West Africa. While living in Israel, he also worked for the Jerusalem Post and several Jewish organizations.