None - that came later. From what I can find in my explorations the sentiments were pretty evenly divided with sympathizers representing both the north and the south. One thing that appears to have been a calming influence was that the sitting governor wasn't a Republican or a Democrat - he was a member of the Know Nothing (American Party) party.
And no - I didn't think that Maryland would be allowed to secede, given its strategic position. The ironic thing is that, if not for the insistence by the south that the nations capitol be moved from Philadelphia to Washington DC it would have been a moot point.
Breckinridge solidly carried Maryland, just like the other states that comprised the Confederacy. Lincoln got a whopping 4 votes in the county I grew up in—all four were asked to leave. I think you underestimate the strength of Southern Sentiment in what was (south of the Mason-Dixon Line) a Southern State prior to the occupation.