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Barack Obama has retold the story behind one of the hallmarks of his historic 2008 presidential campaign, the iconic "fired up, ready to go" chant.

During his last solo appearance campaigning for Hillary Clinton before the US election - at a campaign rally in the critical state of New Hampshire - President Obama talked of his first bid to be president.

He told the crowd of a rainy campaign stop in Greenwood, South Carolina, where he met a small group of supporters while tired and in a bad mood, and explained the origin of the chant, which famously came from South Carolina politican Edith Childs.

It was at that meeting that he heard Childs doing the cry, and it stuck so much that it became a key part of his campaign.

He said: "The thing is, she keeps on doing it. Everybody does. The interesting thing is, after a while, I'm starting to get kind of fired up.

"I am starting to feel like I am ready to go. All of the sudden I am ready to go. All of those negative thoughts drifted away and we had a great meeting. They all said they would support me and that they would go out and work."

He added: "It just goes to show you, how one voice can change a room. And if it can change a room, it can change a city. And if can change a city, it can change a state. And if it can change a state, it can change a nation. And if it can change a nation, it can change the world."