Shouldn't Delaware's Education Secretary, live in Delaware?

One would have thought that Delaware's Secretary of Education Lillian Lowery was a resident of Delaware.  I guess we were all wrong.

 

Just to make sure that we talking about the same person, here is Lowery's profile on the Delaware Department of Education web site.

The big question here is - are there no qualified residents of Delaware that can assume that post?  Why must that post be given to a resident of Virginia?