US Senate Democrats cleared the second of three 60-vote hurdles on President Barack Obama's healthcare overhaul yesterday, moving the landmark legislation one step closer to passage by Christmas.

For the second consecutive day, Democrats mustered 60 party-line votes to cut off debate on the healthcare reform Bill and move toward final passage over unanimous Republican opposition.

The last 60-vote hurdle should come today, with a vote on final passage - which requires a simple majority - now scheduled for late on Christmas Eve tomorrow if Republicans use all their allotted debate time as they have vowed.

The Senate also passed Democratic leader Harry Reid's 383-page amendment making final changes to the measure, including striking a government-run insurance plan and tightening restrictions on using federal funds for abortions.

Those changes helped secure the 60th vote for Democrats on Mr Obama's top legislative priority, which has consumed Congress for months and sparked intense political brawling.

"There is a lot of tension in the Senate," Mr Reid said after the votes. "Let's just all try to get along. Let's try to work through this."

Once passed, the Senate Bill must be melded with a version passed by the House of Representatives last month in what promises to be a difficult negotiation. Both chambers must approve it again before sending it to Mr Obama for his signature.

The negotiations could be tough, with clashes looming on issues like the government-run plan, which is in the House Bill but not the Senate, abortion, and competing approaches on how to pay for the changes.

Republicans criticize the measure as an expensive and heavy-handed intrusion into the healthcare sector that will drive up costs, increase the budget deficit and reduce patients' choices.

The non-partisan Congressional Budget Office says the Senate Bill will cut the federal deficit by $132 billion over 10 years, but critics argue the revenue increases and cost savings called for under the Bill may never materialise.

"There is still time for one senator in the 60 to change their vote," Republican Senator Kay Bailey Hutchison said. "That's why we're still here fighting. We want to stop this Bill and do it right."

The loss of even one Democrat would sink the plan in the 100-member Senate. Democrats control 60 votes, the exact number needed to overcome united Republican opposition.

The overhaul would spark the biggest changes in the $2.5 trillion US healthcare system since the 1965 creation of the government-run Medicare health programme for the elderly.

The Senate Bill would require most Americans to have insurance, extend coverage to 30 million uninsured and give subsidies to help some pay for it. It would also halt industry practices like refusing insurance to people with pre-existing medical conditions.

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