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"In the years since the Massachusetts health care law went into effect nothing has changed my view that a plan crafted to fit the unique circumstances of a single state should not be grafted onto the entire country," Romney writes in a Facebook posting.
Obama is expected to compare his new health care law favorably to the Massachusetts plan during a speech Wednesday in Boston.
Romney, who signed the Massachusetts plan into law when he was governor in 2006, also criticized the rollout of Obama's project.
"Had President Obama actually learned the lessons of Massachusetts health care, millions of Americans would not lose the insurance they were promised they could keep, millions more would not see their premiums skyrocket, and the installation of the program would not have been a frustrating embarrassment," writes Romney.
Romney, the Republican nominee who lost last year's presidential election to Obama, says health care should be a state issue:
"Health reform is best crafted by states with bipartisan support and input from its employers, as we did, without raising taxes, and by carefully phasing it in to avoid the type of disruptions we are seeing nationally."
Romney will not be attending Obama's speech in Boston.