WASHINGTON - Sarah Palin, seen as a possible Republican presidential candidate, has paid tens of thousands of dollars for foreign policy advice to a U.S. firm that represents three overseas governments, campaign finance documents show. While legal, the adviser’s work as an agent for other countries raises questions about whether Palin is receiving impartial information about foreign relations and could be become a subject of debate if she runs for president or another elected office. Financial reports filed by the former Alaska governor’s fundraising committee known as SarahPAC, show that between December 2009 and the end of May 2010, it...