Robert Barnett, a Washington attorney who represented powerful politicians and many of the biggest stars in TV news business, died Friday after a long, unspecified illness. He was 79.

Barnett’s death in a Washington hospital was confirmed by his wife, retired CBS News correspondent Rita Braver.

A longtime partner at the Washington law firm Williams & Connolly, Barnett was the go-to lawyer for politicians and public officials moving into private life. He helped procure multimillion-dollar book contracts for former Presidents Obama, Clinton and George W. Bush.

Barnett was a Democratic political insider as well. He would play opposing candidates in mock debates to help prepare the presidential tickets of Al Gore and Joe Lieberman in 2000, John Kerry and John Edwards in 2004, Hillary Clinton when she first ran for president in 2008, and Democratic vice presidential nominee Geraldine Ferraro in 1984.

“I baited [Ferraro] a lot and she got so angry with me that she frequently walked over to me and slugged me on the arm,” Barnett told CNN in 2008. “So I left the process black and blue.”

Barnett was also Bill Clinton’s debate sparring partner during the 1992 presidential campaign. He also advised the Clintons when White House aide and family friend Vince Foster killed himself in 1993 and when the world learned that Bill Clinton had an affair with White House intern Monica Lewinsky.

Barnett’s TV news client list included former NBC News anchor Brian Williams, “60 Minutes” correspondent Lesley Stahl, CNN’s Sanjay Gupta, Chris Wallace, NBC News correspondent Andrea Mitchell, and Jesse Watters and Peter Doocy at Fox News. He also represented his wife, whom he married in 1972.

Barnett also navigated Ann Curry’s messy exit from NBC’s “Today” in 2012.

As an attorney, Barnett was known for his ability to come up with deals tailored to the needs of his clients.

“Many of these people who come out of government have an enormous number of offers,” Barnett told the Financial Times in 2008. “The first thing we do is sit down and say: ‘What are your goals? Do you want to live here or there? You wanna make money or have fun?’”

One reason many clients gravitated to Barnett is that, unlike agents, he did not take a commission. They paid a high hourly rate for his services, not the traditional agent fees of 10% to 15% of salaries or book advances.

Barnett’s clients believed he gave them 100% regardless of their stature.

“Bob represented me in my negotiations with ABC and made me feel just as important as his more celebrated clients,” retired correspondent Judy Muller wrote on Facebook. “A really decent, smart man.”

The sentiment was shared by CBS News Executive Editor Susan Zirinsky.

“Every person who worked with Bob knew their secrets were safe,” Zirinsky said in an interview. “He was the ultimate protector.”

Barnett also drew praise from the companies that paid the lucrative contracts for his TV clients.

“His pristine integrity, wise counsel and knowledge of our business were an invaluable resource to me over the course of our 30-year relationship,” Suzanne Scott, chief executive of Fox News Media, said in a statement.

Barnett also represented bestselling authors James Patterson and Mary Higgins Clark.

Barnett was born in Waukegan, Ill., where his father operated the local Social Security office and his mother worked part time in a department store. He majored in political science at the University of Wisconsin and received a law degree from the University of Chicago.

He moved to Washington in the early 1970s. He clerked for Supreme Court Justice Byron White and worked as an aide to then-Sen. Walter Mondale of Minnesota. He joined Williams & Connolly in 1975, and was made a partner three years later.

In addition to his wife, he is survived by a daughter, Meredith Barnett; a sister; and three grandchildren.