Wellstone began his political career as the underdog, deciding in 1990 to challenge incumbent Republican Rudy Boschwitz for the U.S. Senate.

CNN: Wellstone made mark as liberal champion

Rudy Boschwitz, irritating his rival's staff and dramatizing Boschwitz's refusal to debate.

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Rudy Boschwitz , Coleman also has taken some stances that don't square with most Minnesota voters, including opposition to abortion rights and gun control.

CNN: Fight for control of Senate intensifies

Rudy Boschwitz, the only challenger that year to unseat an incumbent.

CNN: Coleman wins Minnesota Senate race