Defining Mitt Romney: Obama has a head start

Some Republican strategists worry about overcoming the president's negative portrayal of the GOP candidate, who has yet to flesh out his character for voters.

WASHINGTON — Mitt Romney is now out-raising President Obama's campaign money machine, the most prodigious in history. But nervousness has crept into Republican ranks because the unofficial nominee hasn't fully defined himself in voters' minds — something the president has been eager to do for him.

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