By the 1950s Byrd was one of the most influential senators, serving on the Armed Services Committee, and later as chairman of the Finance Committee. He often broke with the Democratic Party line, going so far as to refuse to endorse the reelection of liberal President Harry S Truman in 1948. He also refused to endorse Adlai Stevenson in 1952. He voted against public works bills, including the Interstate Highway System, and played a key role in the passing of the 1964 Revenue Act. He had blocked the bill until President Lyndon Johnson agreed to decrease the total budget to under $100 billion. Subsequently, he helped push the Act through.