structural:reformatting, linguistic:voice_change
Entry into politics

After Richard M. Kleberg won a 1931 special election to represent Texas in the United States House of Representatives, he appointed Johnson as his legislative secretary. This marked Johnson's formal introduction to politics. Johnson secured the position on the recommendation of his father and that of state senator Welly Hopkins, for whom Johnson had campaigned in 1930. Kleberg had little interest in the day-to-day duties of a Congressman, instead delegating them to Johnson. After Franklin D. Roosevelt won the 1932 U.S. presidential election, Johnson became a lifelong supporter of Roosevelt's New Deal. Johnson was elected speaker of the "Little Congress", a group of Congressional aides, where he cultivated Congressmen, newspapermen, and lobbyists. Johnson's friends soon included aides to President Roosevelt as well as fellow Texans such as vice president John Nance Garner and congressman Sam Rayburn.

In 1935, Johnson was appointed head of the Texas National Youth Administration, which enabled him to create government-funded education and job opportunities for young people. He resigned two years later to run for Congress. A notoriously tough boss, Johnson often demanded long workdays and work on weekends. He was described by friends, fellow politicians, and historians as motivated by lust for power and control. As Caro observes, "Johnson's ambition was uncommon – in the degree to which it was unencumbered by even the slightest excess weight of ideology, of philosophy, of principles, of beliefs."