"One of the first things I want to talk to Barack about is how we must do more to try and solve this crisis (in Syria). Above all, congratulations to Barack. I've enjoyed working with him, I think he's a very successful U.S. president and I look forward to working with him in the future."— British Prime Minister David Cameron, on a visit to Syrian refugees on the Jordanian border.

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"Your re-election is a clear choice in favor of an America that is open, unified, completely engaged in the international scene and conscious of the challenges facing our planet: peace, the economy and the environment." — French President Francois Hollande.

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"When you were elected in 2008, you inspired the world with a call to take responsibility for the problems we face as global citizens. Since then, you have made earnest efforts to live up to that great hope and trust placed in you by the American public. I believe you have been re-elected now in recognition of that effort." — the Dalai Lama.

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"The bond between Europe and North America, based upon the shared values on which our alliance was founded over 60 years ago, remains as strong, and as important to the preservation of Euro-Atlantic peace and security, as ever. President Obama has demonstrated outstanding leadership in maintaining this vital bond." — NATO Secretary General Anders Fogh Rasmussen.

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"I will continue to work with President Obama to preserve the strategic interests of Israel's citizens." — Israeli Prime Minister Benjamin Netanyahu, who has had a strained relationship with the American president over Iran and the Israeli-Palestinian conflict.

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"During the last four years when Obama was U.S. president, no breakthrough happened in relations between Iran and the US. At the beginning of his first term the situation was a bit better, but as he went on the relations got much worse, with the sanctions being imposed. So I think the outcome of the elections that was just held will not make any difference for Iran." — Amir Karimi, a resident of the Iranian capital, Tehran.

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"As a mother and as a grandmother who raises boy children, I think that the symbolism of having a black man occupy the highest office is something that can make my children very aspirational to know that this is possible, you know, in their lifetime" — Zindzi Mandela, daughter of former South African President Nelson Mandela.

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"If both parties try to overcome the accumulated distrust and turn over a new leaf, if America comes to realize that it needs to work with Vladimir Putin instead of thinking that it doesn't like the Russia that we live in, then we could achieve results." — Alexei Pushkov, chairman of the Russian Duma's foreign affairs committee, calling for a new start to U.S.-Russia relations.

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"Sandy was a climate change warning. Obama must now take the stage and fulfill the promise of hope the world needs." — Kumi Naidoo, international executive director of Greenpeace.