WASHINGTON (Reuters) - Mitt Romney and his Republican allies raised more than President Barack Obama and the Democrats in the first 17 days of October as both presidential campaign efforts approached the $1 billion mark, with Obama in the lead, disclosures showed on Thursday. The tight 2012 presidential race has become the costliest in U.S. history thanks to massive spending on advertising and get-out-the-vote efforts by the campaigns and by outside groups that have no fundraising limits. ...

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