And while the district voted for GOP presidential nominee Mitt Romney with 61 percent in 2012, there remains a third possibility that a Democrat can eke into a runoff if the second-tier Republicans carve up the conservative vote.
Operatives say Mayo, an African-American mayor of one of the districtís largest cities, would likely be the Democrat who could pull off that scenario.
However with other Democrats in the race, including state Reps. Marcus Hunter and Robert Johnson, the party would need to unite behind just one candidate for Mayo to be successful.
With a low turnout predicted for the contest, operatives say anything can happen on Saturday.
ďAnybody that can successfully predict this special election should be a professional horse gamer,Ē one Republican said.
Following the speeches from elected officials, the crowd stands at long tables as they dig into BBQ, brunswick stew, cadillac rice at the Law Enforcement Cookout at Wayne Dasher's pond house in Glennville, Ga., on Thursday, April 17, 2014.