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Romney accuses Obama of 'disgusting and demeaning tactics'

14 July 2012 Last updated at 14:24 BST

The war of words in the US presidential campaign has escalated with the Republican challenger, Mitt Romney, accusing President Obama of using 'disgusting and demeaning tactics'.

Mr Romney denies charges from the Obama camp that he was in charge of the firm, Bain Capital, when it invested in companies that moved American jobs overseas.

Mike Wooldridge reports.