Question:  The 1996 United States Senate election in Georgia was the first election after the retirement of the current co-chair of what organization?
Sentence (from "United States Senate election in Iowa, 1996"): Incumbent Democratic United States Senator Tom Harkin sought re-election to a third term in the United States Senate, and he was challenged by United States Congressman Jim Ross Lightfoot from Iowa's 3rd congressional district.
Relevant evidence: No