In 1946, Thompson ran for and won the newly-created office of
Lieutenant Governor of Georgia. Following Thompson's election, Governor-elect
Eugene Talmadge died on December 21, 1946, and the
Georgia State Constitution was vague on who would be sworn in as governor, causing the
three governors controversy. Thompson felt that as the Lieutenant Governor-elect, he should become the Governor. But the state legislature, controlled by Talmadge supporters, invoked a clause in the constitution allowing the legislature to pick between the second- and third-place candidates. The people who finished second and third were two write-in candidates, Eugene Talmadge's son,
Herman E. Talmadge and James V. Carmichael. The legislature elected Herman Talmadge as governor; but Thompson and Arnall both claimed the office. Arnall later renounced his claim to support Thompson on January 18, 1947. == 70th Governor of Georgia==