Fear of a Black Electorate

I'm wondering if there's some nefarious interplay between white fear and early voting. According to a discussion on yesterday's "Meet the Press," African American turnout has been enormous in Southern states that allow early voting, such as Georgia. What is the reaction of whites voters with less than positive views toward blacks who see blacks turning out to vote in enormous numbers? They might not be able to do anything about it when everyone votes on the same day. But when you have a few weeks to organize an opposition, does high black turnout stimulate high white turnout?