Democrat Ron Wyden wins the U.S. Senate seat vacated by Bob Packwood -- before interest groups were taking credit. Environmentalists, pro-choicers, unions, and the Democratic Party all say they made the difference in the reed-slim victory margin. NPR's Wendy Kaufman finds local pols saying negative campaigning, the weather, and the first-ever mail-in balloting had more to do with the result.
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