A new CNN/ORC poll in Georgia finds Michelle Nunn (D) has a slight lead over David Perdue (R) in the U.S. Senate race, 47% to 44%. In a hypothetical runoff if neither reaches 50% on Election Day, Nunn still holds a small margin over Perdue, 51% to 47%. Caveat: "But the poll's likely voter model can only estimate the November electorate, as a runoff election can draw a smaller and different crowd than the general election."