MOUNT VERNON, Wash. — Politicians seeking to restrict access to abortion, a marked trend this year from North Dakota to Arkansas, tend not to get much traction in this part of the country.

Washington is heavily Democratic, leaning left especially on social issues. A majority of voters even put into law a statutory right to abortion in 1970 — the only state ever to do that. The governor, Jay Inslee, a Democrat, is pushing the Legislature even now to pass a law at a special session on Monday requiring health insurers to pay for elective abortions, another first for the state if it makes it to Mr. Inslee’s desk.

But now a wave of proposed and completed mergers between secular and Roman Catholic hospitals, which are barred by church doctrine from performing procedures that could harm the unborn, is raising the prospect that unelected health care administrators could go where politicians could not.

The merger wave is mirrored around the country, driven by the shifting economic landscape in health care and the looming changes in federal regulation. Previous Catholic takeovers in Kentucky, Illinois and Pennsylvania have made news and drawn scrutiny.