US presidential support map

US presidential support map

With his hopes of a second term under threat, US President Barack Obama will seek to summon fresh energy Tuesday to thwart Mitt Romney's momentum in their crucial second debate. Republican Romney's assured performance in the first encounter two weeks ago in Denver, and Obama's own lifeless showing, dented the president's polling numbers, leaving the race effectively tied 21 days before the election.Graphic: Sapa.

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