Santorum challenges Romney in Michigan speech (AP)

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AP - An aggressive Rick Santorum went after Mitt Romney on multiple fronts Thursday, challenging the Republican front-runner's economic policies, values and consistency in the city of his birth.

Source: http://us.rd.yahoo.com/dailynews/rss/topstories/*http%3A//news.yahoo.com/s/ap/20120216/ap_on_el_pr/us_santorum

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