Roberts County was one of the earliest counties in Texas to turn Republican. The last Democrat to win the county in a presidential election was Harry S. Truman in 1948, when he carried nearly 76% of its ballots. No Democrat has since exceeded the 40% of the vote that Texas native Lyndon B. Johnson won in the county in his 1964 national landslide. Jimmy Carter in 1976 was the last Democrat to win even 30% of the county's vote, Bill Clinton in 1996 to win 20%, and Al Gore in 2000 to win just 10%.
