TALLAHASSEE, Fla. -

Calling it a "compassionate, common-sense step forward," Gov. Rick Scott on Wednesday said he would support a potentially massive expansion of the Medicaid program under the federal Affordable Care Act.

The announcement was a dramatic move for the Republican governor, who launched his political career as an outspoken critic of President Obama's efforts to overhaul the health-care system. The announcement also shifts the focus of the contentious Medicaid debate squarely to the Legislature, which would have to approve any expansion.

"We have a choice --- and it's not an easy choice --- but my job is to worry about every Florida family,'' Scott said during a news conference at the Governor's Mansion.

Even before Scott started the news conference, House Speaker Will Weatherford, R-Wesley Chapel, issued a statement that stopped far short of an endorsement of the expansion. Weatherford said he is looking forward to the recommendations of a select committee that has been studying the Affordable Care Act and that the House's "actions will be based on principle and rooted in facts."

"Governor Scott has made his decision and I certainly respect his thoughts,'' Weatherford said. "However, the Florida Legislature will make the ultimate decision. I am personally skeptical that this inflexible law will improve the quality of health care in our state and ensure our long-term financial stability."

Scott said he would support expanding Medicaid eligibility for three years --- a period of time in which the federal government is supposed to pay 100 percent of the expansion costs. He said the expansion would have to go through a reauthorization process after three years, which would give the state a chance to determine how it affects health-care costs, quality and access.

The move could lead to hundreds of thousands of newly eligible people signing up for Medicaid coverage. But Scott's stance drew sharply different reactions, with Democratic lawmakers and groups such as Planned Parenthood applauding the governor and conservative activists all but calling him a traitor.

"Candidate Scott ran on fighting Obamacare and was a leader in that movement," said Slade O'Brien, Florida director of the conservative group Americans for Prosperity. "To switch, it's one of the biggest flip-flops I've ever seen. It's going to be remarkably disappointing to the conservative base."

The Florida Association of Planned Parenthood Affiliates, meanwhile, sent an email pointing to the fact that about one in five Floridians lack health insurance. It said expanding Medicaid will ensure that women and families have access to basic care.

"Politics should not stand in the way of Floridians getting the preventive care they need,'' said Judith Selzer, vice president of public policy and communications for the Planned Parenthood affiliates.

Channel 4 spoke with people Wednesday night who said they weren’t sure how they feel about the governor’s decision.

"...He’s just giving in to pressure," said Raymond Walker. "I don’t think he should give in at all."

Walker is almost 60, and said he doesn’t access Medicaid benefits. His opposition to the governor’s announcement stems from his criticism to the Affordable Care Act. 

"I think personal healthcare would be much better. Get insurance companies competing, for that. We’re a competitive country, that’s just the way it ought to be done," said Walker.  

“Scott came around to what everyone has known all along: accepting federal funds to extend Medicaid to 1.3 million Floridians is good for hospitals, businesses, state and local governments and, most importantly, the people who need health care," said Ethan Rome, executive director of Health Care for America Now.

"This stunning about-face is merely the latest move to repackage a governor whose approval rating with Floridians remains as toxic as his Tea Party agenda. But Scott’s election year makeover on issue after issue is fooling no one and simply underscores his central problem: he can’t be trusted," said Florida Democratic Party Chairwoman Allison Tant.

Americans for Prosperity-Florida’s State Director Slade O’Brien called Rick Scott's announcement "extremely disappointing."  

“Florida’s Medicaid program already costs the taxpayers more than $20 billion a year, and the financial burden will only grow if a million new people are added to the program. Hopefully our legislative leaders will not follow in Governor Scott’s footsteps and will reject expansion of this broken system," said O'Brien. 

Scott's announcement came several hours after the Obama administration sent a letter to the state indicating it would approve a proposal to shift almost all Medicaid beneficiaries into managed-care plans. Scott and Republican legislative leaders have long championed that controversial idea, which they say would help hold down Medicaid costs and better coordinate care for beneficiaries.

Speculation swirled in the Capitol on Wednesday about whether federal approval of the managed-care proposal would be tied to state approval of the Medicaid expansion. But Scott denied such a linkage.

Scott and other Republican leaders spent more than two years fighting the Affordable Care Act, which Obama and congressional Democrats approved in March 2010. That fight included a Florida-led legal challenge that ended up in a landmark U.S. Supreme Court case. Justices upheld most of the law, but said states must be able to decide whether to carry out the law's Medicaid expansion.

Republicans have rejected another part of the law that gave the state the choice of running a health-insurance exchange. They decided to let Washington run the exchange, which will be an online marketplace where Floridians can shop for insurance coverage.

But in explaining his decision on the Medicaid expansion, Scott said the overall Supreme Court ruling and Obama's re-election in November cemented the Affordable Care Act as the "law of the land." He said he has not changed his view that the best way for people to get health coverage is through their jobs, but he said his decision is aimed at making sure all Floridians have access to care.

"It is not a white flag of surrender to government-run health care,'' said Scott, who made a fortune as the hard-driving chief executive of a hospital company.

Perhaps the most-important part of the expansion is that it would make Medicaid coverage available to hundreds of thousands of childless adults who in most cases are not currently eligible for the program. Also, the law would raise the income threshold for eligibility to 138 percent of the federal poverty level, which is higher than the threshold for many people currently enrolled.

The federal government has promised to pay 100 percent of the expansion costs from 2014 through 2016 and then gradually reduce that share to 90 percent in 2020. But Scott and many Republican lawmakers have repeatedly raised questions about how much money the state could be required to pay in the future.

A report released last month by the state Agency for Health Care Administration indicated that Florida could face costs of $3 billion or more over 10 years. But analysts are scheduled to meet March 1 to revise the estimates, and the new numbers could play an important role as lawmakers decide whether they want to pursue an expansion.

While Scott would require what is known as a "sunset" process after three years, it was not immediately clear Wednesday what would happen if the expansion was not reauthorized. Such a process raises the possibility of newly eligible people losing their benefits after three years.

House Democratic Leader Perry Thurston, D-Plantation, said he would prefer that Scott didn't seek the three year-restriction on the expansion. Nevertheless, Thurston said he was pleased by Scott's announcement.

"I am confident that this important and necessary expansion of Florida's Medicaid program will improve the quality of health care in our state and can be achieved in an affordable manner,'' Thurston said.

But with Scott running for re-election in 2014, he could face a backlash from conservatives who put him into the governor's mansion.

"Will Medicaid expansion cover me for the knife (Scott) just buried in my back?'' Henry Kelley, a tea party leader in Florida, said in a Twitter message.