That's been one of the favorite phrases of the mouthbreathing crowd since the 2000 election.
Apparently, Lindsey Graham and, according to him, the state of South Carolina still haven't "gotten over" that whole freeing of the slaves thing.
The part I find most offensive about this is that I imagine a significant part of South Carolina's population has indeed "gotten over" Lincoln. About 30% of South Carolina's population is African-American, and I'd imagine some of them have "gotten over" Lincoln.