Washington ? House Democratic leaders Thursday abandoned a long struggle to strike a compromise on abortion in their ranks, gambling that they can secure the support for President Barack Obama’s sweeping health care legislation with showdown votes looming as early as next week.

In doing so, they are all but counting out a small but potentially decisive group whose views on abortion coverage have become the principal hang-up for Democrats fighting to achieve the biggest change in American health care in generations. Congressional leaders are hoping they can find enough support from other wavering Democrats to pass legislation that only cleared the House by five votes in an earlier incarnation.

The concession came as House Democrats attended a lengthy meeting with White House health adviser Nancy Ann DeParle, who tried to answer questions, resolve differences and calm nerves, especially for lawmakers expecting tough challenges in November. Participants said they generally embraced White House-brokered compromises on prescription drug benefits for the elderly and new taxes on generous insurance plans.

At stake is the president’s call to expand health care to some 30 million people who lack insurance and to prohibit insurance company practices such as denying coverage to people who have been sick. Almost every American would be affected by the legislation, which would change the ways many people receive and pay for health care, from the most routine checkup to the most expensive, lifesaving treatment. And most Americans would be required by law to get health insurance.

Republicans continued their fierce criticisms of the president’s efforts, vowing to make Democrats pay dearly in the fall elections if they don’t back off from what they brand a government takeover of health care. But senior Democrats predicted they can convince their colleagues that doing nothing is the worst option of all, politically and substantively.

“The stars are aligning for victory on comprehensive health reform,” said Sen. Tom Harkin, D-Iowa.

White House Chief of Staff Rahm Emanuel emerged from a meeting in the Capitol with top Democratic lawmakers Thursday night saying, “We made a lot of decisions. We’re getting towards the end.”

The end might be near, but the outcome remains uncertain. House Speaker Nancy Pelosi, D-Calif., must round up at least 216 votes when the real nose-counting and arm-twisting begin in a few days, after final cost estimates arrive from the Congressional Budget Office. All House and Senate Republicans have vowed to oppose the legislation.

With Senate Democrats no longer able to block Republican filibusters, the strategy calls for House Democrats to embrace a health bill the Senate passed in December, despite their numerous objections. Democratic senators in turn would promise to make a limited number of changes under “budget reconciliation” rules, which bar filibusters.