He was the only sitting senator from a Confederate state who did not resign his seat upon learning of his state's secession. In 1862, Lincoln appointed him as military governor of Tennessee after most of it had been retaken. In 1864, Johnson was a logical choice as running mate for Lincoln, who wished to send a message of national unity in his re-election campaign; their ticket easily won. According to his biographer, Hans L. Trefousse, Johnson 'demolished' the opposition in debate and won the election with almost a two to one margin. During his Greeneville days, Johnson joined the Tennessee Militia as a member of the 90th Regiment. He attained the rank of colonel, though while an enrolled member, Johnson was fined for an unknown offense. Afterwards, he was often addressed or referred to by his rank. I am not aware that I have ever given him cause for offense.
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