A "seasoned" mayor of a municipal will be highly likely to concentrate on fixing social "problems," as he would see them, by way of more social programs, a bigger, stronger judicial with fewer constitutional restrictions, and fancier video productions (to cram the programs into policy/law). Do you remember Clinton's "100,000 new police on the street" program? Municipal experience provides a background that would work very much against military defense, IMO. I've worked and taken oaths for both before.
Uh, yeah, sure.