BOCA RATON, Florida (Reuters) - When President Barack Obama and Mitt Romney face off on Monday in their third and final debate, it will be the Republican challenger's last best chance to recover from his botched "Libya moment" and exploit vulnerabilities in his opponent's foreign policy record. But Romney has an uphill struggle to make his case against Obama, who will be buoyed by the advantages of incumbency as well as polls showing him with an edge - though a shrinking one - on the question of who is more trusted in global affairs. ...

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