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. Arnall felt he should continue being governor even though he lost the election.
Herman E. Talmadge (Eugene's son), and current senator at the time, tried to claim the office as well. He even arrived at the state capital with a gun tucked in his belt. He then had the locks changed to stop Arnall and Thompson from entering. 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, Herman E. Talmadge and James V. Carmichael. The legislature elected Herman Talmadge as governor based on write-in votes he producted from his house that were later proven fraudulent which stripped him of his governorship. Arnall later renounced his claim to support Thompson on January 18, 1947. == 70th Governor of Georgia==