"He didn't necessarily win a lot of votes, but he had a voice that had to be listened to," said UNC political science Professor Thad Beyle, who worked with Wellstone during his time at the University.
The senator was killed Friday morning when his plane crashed in northern Minnesota.
Also killed in the accident were Wellstone's wife, Sheila, daughter, Marcia, and five others on board.
The twin-engine plane went down in freezing rain and light snow near the Eveleth-Virginia Municipal Airport, about 175 miles north of Minneapolis.
Wellstone, 58, was traveling to the funeral of the father of a state legislator.
He is survived by two sons and six grandchildren.
Wellstone's transition from academic to politician began at UNC, where he graduated Phi Beta Kappa in 1965 with a degree in political science. He earned a doctorate in the same subject in 1969. He participated in varsity wrestling, which culminated in his winning the ACC championship in 1964 for his weight class.
The senator became politically involved during his undergraduate career, said Beyle, who served on Wellstone's doctoral dissertation committee. He described the period of Wellstone's enrollment as politically tense, with issues like civil rights protests occupying students.
After graduating, Wellstone taught political science at Carleton College in Northfield, Minn.