Lincoln did not viciously slander his opponents in political ads the way Grayson did towards Webster.
Lincoln did not seek support from the lowest dregs and extremists of society the way Grayson does with his interactions with the DUmmies.
Lincoln never crashed a car into a bus full of people, injuring several of them after running a red light due to being distracted by talking on his cell phone the way Grayson did. Then again, of course, cars, traffic lights, and cell phones weren't invented yet in Lincoln's time, so maybe that's not fair.
Lincoln was about unity; Grayson, like most Democrats, is about division.