Mark Zuckerberg technically doesn't have a college degree either. And the situation as to why he doesn't is actually kind of similar to Walker's.
For all of Walker's problems and issues he has and the stuff bedstuy is touching on, it's kind of absurd for anyone to think this would be an issue. He's a pretty awful candidate and this ranks near the bottom of the list of reasons why.
Zuck dropped out to found one of the most transformative, significant companies in modern history.
Walker dropped out to take a rather unremarkable sales job of the sort that he could have easily gotten elsewhere had he just waited a semester and finished his degree. In a way, it's oddly similar to the CADD saga.