Assume 1980 if you need to assume a year.
Senator Javits R-NY was the most liberal Republican to serve in Congress during the 1937-2002 period. He was defeated in the primary in 1980, and ran and lost on the Liberal party line.
Larry McDonald D-GA was the batsh**t extreme right-wing ultimate DINO from Georgia. During that period, only Ron Paul had a more right-wing voting record, although some other Republicans from the last decade have beaten him for extremism. He was killed when the Soviets downed the plane he was in.
http://voteview.com/Is_John_Kerry_A_Liberal.htm
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