Yeah, the most important point has been made already, but...
Firstly, Baltimore county, according to DRA, voted more for local Democrats than for Obama. This tendency was particularly pronounced in the city's eastern suburbs along Chesapeake bay, going into Harford.
The Democratic Party is the local Party of Government in basically all of Maryland. Voters trust them to run local services (or at least not to cock up doing so quite so badly as the by-definition-inexperienced Opposition presumably would. I think that's more accurate, all things considered).
Whitey.
Only in the sense that it covers most of the city's middle ring of suburbs. Which is not actually a meaningless sense of the term. So yes and no.