Maryland Election Law Section 5-1003

      (a)      This section applies to a vacancy in nomination for Representative in Congress, State Senator, or member of the House of Delegates, if the district includes more than one county.

      (b)      (1)      A vacancy in nomination under this section that occurs because the nominee dies, withdraws the candidacy, or is disqualified for any reason shall be filled by a vote of the central committees of the political party in each of the counties included in the district of that nominee.

            (2)      The central committee of each county shall cast a vote that is proportionate to its share of the population in that district as reported in the most recent decennial census of the United States and promptly notify its State central committee of the results of its vote.

            (3)      (i)      If no person receives a majority of the votes cast under paragraph (2) of this subsection, or if there is a tie vote by the central committees, the vacancy in nomination shall be filled by the State central committee.

                  (ii)      In the event of a tie vote, the nominee selected by the State central committee shall be one of the candidates involved in the tie.

            (4)      By the later of the 40th day before the general election or the fifth day following the death, declination, or disqualification of the nominee:

                  (i)      the State central committee shall file a certificate of designation for the nominee with the State Board; and

                  (ii)      the successor nominee designated by the State central committee under subparagraph (i) of this paragraph shall file a certificate of candidacy with the State Board.