Nation

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Top U.S. military officer Adm. Mike Mullen went to Pakistan Tuesday to discuss concerns over Islamabad's efforts to combat militant fighters and to address rising tensions over reports that U.S. forces have engaged in unauthorized raids there.

Every four years, the Democratic and Republican National Conventions draw thousands of members of the media who devote hours of coverage and an ever-evolving set of resources -- from print to television to online -- to cover the political event.