Question: What committee did an American politician and veterinarian, that predicted the United States Senate election in Alaska, 2008 would be competitive, serve as chairman for? 
Sentence (from "United States Senate election in Alaska, 2008"): It was one of the ten Senate races that U.S. Senator John Ensign of Nevada, the chairman of the National Republican Senatorial Committee, predicted as being most competitive.
Relevant evidence: Yes