There was as vote of the Maryland legislature on April 29, 1861. They voted secession down.
Because, as you very well know, Lincoln had arrested any legislators who might have voted the other way.
That falls considerably short of complete accuracy. The legislature did not "vote secesion down" at that session. The lower house voted to denounce and to have no part of the war "which the Federal Government had declared on the Confederate States." They did not consider an ordinance of secession at that time. When it appeared that a secession ordinance might be voted in in the fall session of the legislature, Lincoln had the legislators who were expected to support secession arrested; this was a completely illegal act.
My source is McPherson, pp. 287-289.