Abraham Lincoln was more than just a foe of slavery. He was also a mixed-race eugenicist, believing that the intermarriage of blacks and whites would yield an American super-race.

Or at least, that’s what newspapers in 1864 would have had you believe. The charge isn’t true. But this miscegenation hoax still “damn near sank Lincoln that year,” says Heather Cox Richardson, history professor at Boston College.

In February 1864, Lincoln was preparing for a tough re-election campaign amidst a bloody civil war when he and his Republican party were blindsided.