During the secession crisis, Johnson remained in the Senate even when Tennessee seceded, which made him a hero in the North and a traitor in the eyes of most Southerners. In 1862 President Lincoln appointed him Military Governor of Tennessee, and Johnson used the state as a laboratory for reconstruction. In 1864 the Republicans, contending that their National Union Party was for all loyal men, nominated Johnson, a Southerner and a Democrat, for Vice President.