AMES, Iowa (Reuters) - Republican presidential candidate Mitt Romney attempted to adopt the mantle of change on Friday in an economic speech in which he vowed to bring a fresh start to Washington to generate stronger job growth. Romney's address in the swing state of Iowa was an effort to take on the role President Barack Obama played in 2008, that of an outsider who would represent an abrupt change if he wins the tight 2012 presidential race. ...

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