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Erica Werner (HuffPo):

Democratic Sen. Mary Landrieu says she will vote "yes" on a crucial test vote on the health care bill.

The Louisiana lawmaker made the long-awaited announcement in a speech on the Senate floor Saturday. Her comments came just hours before the 8 p.m. EST vote.

Landrieu says her vote is to move forward but that work still needs to be done on the bill.

Landrieu has been one of two Democratic holdouts; the other is Sen. Blanche Lincoln of Arkansas. Senate Majority Leader Harry Reid needs 60 votes to prevail in the 100-seat Senate. The 40 Republicans are unanimously opposed.

A largely overlooked provision in the Senate bill would send $100 million to Louisiana to help it cover costs for Medicaid, the federal-state health care program for the poor.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

WASHINGTON (AP) – Democrats called a revamp of the nation's health care system long overdue as historic legislation advanced toward a Saturday night Senate showdown, an early test of party unity on President Barack Obama's top domestic initiative

"The country suffers when there is a failure to act on serious challenges that millions of ordinary Americans face in their daily lives," Sen. Patrick Leahy, D-Vt., said during debate in a rare weekend session.

Democratic leaders are optimistic of success, but they need every Democrat and both independents to vote "yes," and two moderates remained uncommitted ahead of the roll call, which is expected around 8 p.m. EST. The vote will determine whether debate can go forward on Majority Leader Harry Reid's 2,074-page bill to overhaul health care over the next decade.

United in opposition, Republicans cast the bill as a costly government takeover, built on budget gimmicks.

"Move over, Bernie Madoff. Tip your hat to a trillion-dollar scam," said Sen. Kit Bond, R-Mo., referring to the mastermind of a multibillion-dollar Ponzi scheme.

Most everyone would be required to purchase insurance under Reid's legislation, and billions in new taxes would be levied on insurers and high-income Americans to help extend coverage to 30 million uninsured. Insurance companies would no longer be allowed to deny coverage to people with medical conditions or drop coverage when someone gets sick.

The two Democratic holdouts are Sens. Blanche Lincoln of Arkansas and Mary Landrieu of Louisiana. A third centrist, Ben Nelson of Nebraska, announced Friday that he'd be supporting his party on the test vote, while cautioning that it didn't mean he'd be with them on the final vote.

"It is not for or against the new Senate health care bill," Nelson said. "It is only to begin debate and an opportunity to make improvements. If you don't like a bill, why block your own opportunity to amend it?"

If that same reasoning holds with Lincoln and Landrieu, Reid, D-Nev., will have the 60 votes he needs to prevail in the 100-seat Senate. The 40 Republicans are unanimously opposed.

Landrieu has made comments suggesting she'll support the move to debate, but Lincoln, who faces a difficult re-election next year, carefully avoided taking any public position Friday.

Republicans used their weekly radio and Internet address to slam the legislation, calling it a government takeover of health care that would increase taxes and raise medical costs.

"This 2,000-page bill will drive up the cost of health care insurance and medical care, not down," Sen. Mike Crapo, R-Idaho, said in the address. "This is not true health care reform, and it is not what the American people want. This bill will result in higher premiums and higher health care costs for Americans – period."

The White House issued a statement late Friday praising the Senate measure.

The action in the Senate comes two weeks after the House approved a health overhaul bill of its own on a 220-215 vote. After the vote Saturday night, senators will leave for a Thanksgiving recess. Upon their return, assuming Democrats prevail on the vote, they will launch into weeks or more of unpredictable debate on the health care bill, with numerous amendments expected from both sides of the aisle and more 60-vote hurdles along the way.

Senate leaders hope to pass their bill by the end of the year. If that happens, January would bring work to reconcile the House and Senate versions before a final package could land on Obama's desk.

The bills have many similarities, including the new requirements on insurers and the creation of new purchasing marketplaces called exchanges where self-employed individuals and small businesses could go to shop for and compare coverage plans. One option in the exchanges would be a new government-offered plan, something that's opposed by private insurers and business groups.

Differences include requirements for employers. The House bill would require medium and large businesses to cover their employees, while the Senate bill would not require them to offer coverage but would make them pay a fee if the government ends up subsidizing employees' coverage.

Another difference is in how they're paid for. The Senate bill includes a tax on high-value insurance policies that's not part of the House bill, while the House would levy a new income tax on upper-income Americans that's not in the Senate measure. The Senate measure also raises the Medicare payroll tax on income above $200,000 annually for individuals and $250,000 for couples. Both bills rely on more than $400 billion in cuts to Medicare.

Howie P.S.: Coincidentally, "Mary Landrieu Wooed To Back Health Care With $100 Million For Her State."