You realize Lincolm shared almost such a view of group superiority? As did many others who were Abolitionists. They objected to slavery, not to white superiority.
Lincoln did not believe in a Master Race in the sense I mean, the one held in the South and in Nazi Germany. There it was meant quite literally, that one race was to be Masters and all others Slaves.
You bet, Lincoln and most other northerners believed in white racial superiority. This POV was, BTW, the “scientific consensus” of the time. But they did not believe this superiority meant other races should be literally enslaved.