I believe that the Maryland Legislature was ready to vote secession, but was intimidated by threats and the presence of Federal troops. So I would imagine that many of the rooted Marylanders are pro-Confederate—though of course not the huge number of Federal Bureaucrats.
It is still illegal to run train through Baltimore without stopping for this very reason. Federal troops trains bound for Washington were stopped, unloaded, and the soldiers marched through Baltimore, before getting back on the train to continue their journey.