He began practicing law with his father in
Pittsburg, Texas and later
Texarkana. In 1902, Morris Sheppard was elected as a
Democrat to replace his deceased father in the
United States House of Representatives. He held the seat until his resignation in 1913, when the
Texas legislature elected him to the United States Senate. In 1914 and while holding the office of Senator, he was on the Central Committee of the First National Conference on Race Betterment, a conference on eugenics held at the Battle Creek Sanatorium. He served as Democratic whip between 1929 and 1933. In the 1928 presidential election, Texas voters abandoned the Democratic candidate,
Alfred E. Smith, Governor of New York and a Catholic, carrying the state for Republican
Herbert Hoover and contributing to his victory. In the summer of 1929,
First Lady Lou Hoover arranged the traditional teas for wives of congressmen, inviting Jessie De Priest, wife of
Oscar Stanton De Priest of Chicago, the first African American elected to Congress in the 20th century. Senator Sheppard was among those who objected to this invitation, quoted as saying, "I regret the incident beyond measure. It is recognition of social equality between the white and black races and is fraught with infinite danger to our white civilization." Sheppard held his Senate seat until his death in Washington, D.C. in 1941. Then-Representative
Lyndon B. Johnson ran for Sheppard's Senate seat in the 1941
special election, and lost to Governor
W. Lee O'Daniel. == Legislative agenda ==