My vote goes to NEW MEXICO STATE. The Aggies have had just FOUR winning seasons since 1967. Last season NMS was 2-10.
Idaho and Utah State are also pretty bad. All three of these teams come from the WAC. Boise State was 3-0 before starting the season every year playing these teams.
There are others, like Vanderbilt but at least they play good competition....who would you nominate?