WASHINGTON (AP) - Mitt Romney will explain more about what he would do as president, a strategy shift intended to change the trajectory of a race that President Barack Obama appears to be winning.

Seven weeks before the election, campaign aides say Romney plans to release a new batch of TV ads, re-focus his campaign appearances on his economic plan and make a series of speeches aimed at offering voters a more concrete outline of his plans for the country.

The move comes as Republicans openly fret about the state of their nominee's campaign and press Romney to give voters a clearer sense of how he would govern.

It also comes as polls show Obama with an edge nationally and in key states, and amid reports of infighting at the Boston-based campaign.

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