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President Barack Obama borrowed a line from George Gershwin on the campaign trail Thursday, telling supporters in Ohio that "the law I passed is here to stay."

Speaking primarily to autoworkers on the beginning of a two-day campaign trip through the key swing states of Pennsylvania and Ohio, the sweating, short-sleeved statesman also used the occasion to jibe at his opponent, Mitt Romney, who opposed the bailout of General Motors and Chrysler.

"Gov. Romney said we (should) just let Detroit go bankrupt," said Obama, according to the global affairs blog The Hill. "I want the goods shipped around the world stamped, 'Made in America,' " he continued, noting that he disagreed with Romney's plan to give "tax breaks" to wealthy individuals and companies outsourcing jobs abroad.

The Romney campaign fired back at Obama for failing to take a harder line with China's trade practices and currency manipulation. "On issues important to the people of Ohio, President Obama has utterly failed to deliver," Romney Spokesperson Amanda Henneberg responded in a prepared statement.

In an interview with CBS News Thursday morning, Romney said that although he disagreed with the Supreme Court ruling upholding Obamacare, the decision was "the final word." He also said he would never nominate a Supreme Court justice whom he knew would make "a decision I violently disagreed with or vehemently, rather, disagreed with."

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