Caro's books portray Johnson as a complex and contradictory character: at the same time a scheming opportunist and visionary progressive. Caro argues, for example, that Johnson's victory in the 1948 runoff for the Democratic nomination for the U.S. Senate was only achieved through extensive fraud and ballot box stuffing, although this is set in the practices of the time and in the context of Johnson's previous defeat in his 1941 race for the Senate, the victim of exactly similar chicanery. Caro also highlighted some of Johnson's campaign contributions, such as those from the Texas construction firm Brown and Root; in 1962 the company was acquired by another Texas firm, Halliburton, which became a major contractor in the Vietnam War. In addition, Caro argued that Johnson was awarded the Silver Star in World War II for political as well as military reasons, and that he later lied to journalists and the public about the circumstances for which it was awarded. Caro's portrayal of Johnson also notes his struggles on behalf of progressive causes such as the Voting Rights Act, and his consummate skill in getting this enacted in spite of intense opposition from Southern Democrats.