Maryland subsequently elected Unionist candidates (albeit slave owning, non-republican ones) to county and state offices. One has to look no further than Prince George's county for evidence that the state's population freely wanted to remain in the Union, provided no changes were made to the status of slavery in their state.
When you consider that you had to be free, white, 21, male, and a property owner, not many voters of Southern sentiment were left.
They had either joined up 'across the river' or been arrested.