Question: Republican challenger Rudolph Ely "Rudy" Boschwitz defeated what Democratic incumbent in the 1978 United States Senate election in Minnesota?
Sentence (from "Rudy Boschwitz"): He served in the Senate from December 1978 to January 1991, in the 96th, 97th, 98th, 99th, 100th, and 101st congresses.
Relevant evidence: No