Dorman served as speaker pro tem of the House for four years and chaired the Prince George's delegation. With his wife, Betty Dorman, he campaigned in the 1960s to get land for Laurel Regional Hospital, then worked to secure both public and private funding. In 2003, he lost to Del. John Giannetti in the Democratic primary and left state politics after authoring more than 300 pieces of legislation. In addition to his career as a legislator, he had an optometric practice.