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Joe Biden and Paul Ryan’s vice presidential debate on Thursday differed sharply from the first presidential debate.

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Biden and Ryan took part in a contentious discussion of foreign policy and domestic issues.

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Ryan gestured while making a point during the debate.

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Biden reacted as Ryan spoke during the debate.

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The debate was characterized by lively exchanges between the political rivals.

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The debate was seen as critical for both campaigns.

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The debate began with a discussion on foreign policy.

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The early discussion touched on the Sept. 11 attack in Libya and on efforts to keep Iran from developing nuclear weapons.

Kevin Lamarque/REUTERS

Vice President Joe Biden and US Representative Paul Ryan shook hands at the start of the debate.

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Moderator Martha Raddatz of ABC News addressed the crowd before the start of the debate.

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Supporters rallied in Danville, Ky., site of tonight's vice presidential debate.

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The debate was seen as critical to each party’s presidential ticket.

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Hats were for sale outside the debate site.

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A man displayed an anti-Obama sign near the debate site.