Still, Mr. Rattner, a well-known media banker, is playing a central role as car czar lite, traveling to Detroit to visit plants, meeting with the automakers’ bankers, unions and bondholders, and advising the White House on which companies seem salvageable and how. If he succeeds, he may get a chance at a larger job in the administration.

That is a big if. He has to push the car companies to overhaul decades-old practices, persuade his former colleagues on Wall Street to lower their demands on the automakers’ debt payments and appeal to union leaders who may be turned off by Mr. Rattner’s financial success.

Mr. Rattner said in an interview that he has long been interested in returning to Washington, where he worked as a newspaper reporter 30 years ago, and that he hoped to stay on for some time to work on aspects of the financial crisis.

“In the fall, as the economic crisis intensified, it became clearer and clearer to me that this was a moment of historic importance,” Mr. Rattner said, “and if one was ever to have an interest in serving your country in the area of economic policy, this was the moment.”

Mr. Rattner has been among the most politically connected people in the banking industry. He and his wife, Maureen White, who together have been referred to by New York magazine as the “D.N.C.’s A.T.M.,” have hosted many Democratic fund-raisers at their lavish apartment on Fifth Avenue. They were initially Clinton supporters, but they hosted events for Barack Obama after he sealed the nomination.

Click here to read the entire article.