“The guy I’m running against tried this in Massachusetts and it’s working just fine, even though he denies it,” Obama said in Ohio Friday.

It was the second time in two days Obama brought up Romney’s health care law, which the White House has long claimed as a model for the Affordable Care Act. In an interview with a local Ohio station on Thursday, Obama accused Romney of flip-flopping by attacking the White House for many of the same policies he once supported.

“One of the things that you learn as president is that what you say matters, and your principles matter,” Obama said. “And sometimes, you’ve got to fight for things that you believe in and you can’t just switch on a dime.”

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“The fact that a whole bunch of Republicans in Washington suddenly said this is a tax — for six years he said it wasn’t, and now he has suddenly reversed himself,” Obama said Thursday. “So the question becomes, are you doing that because of politics? Are you abandoning a principle that you fought for, for six years, simply because you’re getting pressure for two days from Rush Limbaugh or some critics in Washington?”