Darkness reigned. It was 1864, and the nation was split into two warring camps. Casualties rose steadily — previously unimaginable numbers, ultimately reaching about 750,000 dead — and fighting continued throughout the year. Gen. George McClellan, the Democratic nominee, posed a genuine threat to a second term for Abraham Lincoln. McClellan promised a quick, negotiated end to the war; a Lincoln defeat would have led to a permanently divided nation and the preservation of slavery in the Southern states. The fate of the war, the future of the Republic, the nature of the American experiment: Everything hung in the balance. And to preserve that experiment, Lincoln insisted that the presidential election go forward. The president was fully prepared to lose the election and, according to due constitutional form, to surrender power the following March. In August 1864, in a private note, he wrote, “This morning, as for some days past, it seems exceedingly probable that this Administration will not be re-elected.” But he would accept the verdict of the voters. Here was an incumbent president, the commander in chief of a nation facing a sustained armed rebellion, unilaterally subsuming his own ambitions and his own priorities to the very constitutional order currently under siege.