President Obama and Republican challenger Mitt Romney each spent Wednesday campaigning in the battleground state of Ohio, a key prize in the battle to win the November election. Both candidates appealed to voters by attacking the other’s record on China, with Romney saying he will stop the country from taking U.S. jobs. Romney’s comments come days after his tax returns showed his trust has invested in a Chinese oil company doing business with Iran. President Obama criticized Romney’s comments on China.

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