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In the House, Speaker Michael E. Busch, Anne Arundel Democrat, has said he expects to have at least the necessary 71 votes to pass the bill.

Todd Eberly, coordinator of public policy studies at St. Mary’s College of Maryland, said he expects the bill to pass, even though Democrats from conservative and rural areas could receive pressure to vote against it.

“Between the two chambers, the House has been the more progressive of the two,” he said. “Getting out of the Senate was a tremendous victory for O'Malley.”