As mentioned Hoover lived in Iowa as a child and could therefore claim to be an Iowa boy. Evidently he recalled this childhood period with some fondness, for the reasons cited here.
http://www.nps.gov/nr/twhp/wwwlps/lessons/34hoover/34facts2.htm
Point granted - Hoover was an Iowa boy.
Despite all the above, I'm still a bit reluctant to think of Hoover as an Iowa man. Where was he living during his presidential campaign?