Chrysler is bringing back its one-time Washington lobbyist as a special adviser to the automaker's chief executive Sergio Marchionne. The company said Wednesday that Robert Liberatore will work with Marchionne on an interim basis. He is expected to provide advice on external affairs for the company. Marchionne, is CEO of Italy's Fiat Group SpA. Fiat was given a 20 percent stake in Chrysler by the U.S. government and may gain more if it hits certain government targets, which include producing more fuel-efficient vehicles. Liberatore worked for Chrysler from 1985, spending much of that time as the company's top lobbyist. He retired in 2007 as a group vice president. 