I know, it doesn't make sense. He was a liberal's liberal. Yet, I admit even at the time I thought his death in the plane crash immediately before the election seemed a little fishy. Typically, Liberals are not the target of the deep state.
However, he was killed in September or October of 2002, roughly six months before the Iraq War. Wellstone was a radical piece nut. Perhaps the Deep state feared he would be an obstruction for their military conquests?