(WASHINGTONPOST) — MILWAUKEE — Scott Walker was gone. Dropped out. And in the spring of his senior year.

In 1990, that news stunned his friends at Marquette University. Walker, the campus’s suit-wearing, Reagan-loving politico — who enjoyed the place so much that he had run for student body president — had left without graduating.

To most of the Class of 1990 — and, later, to Wisconsin’s political establishment — Walker’s decision to quit college has been a lingering mystery.

Not even his friends at Marquette were entirely sure why he never finished. Some had heard that a parent had fallen ill, or maybe there was some financial strain. Others thought he had simply had enough of school.

Note: Read our discussion guidelines before commenting.