“If a peaceful democratic transition can happen in The Gambia, it can happen anywhere,” Jeffrey Smith, the founder of Vanguard Africa, an advocacy group that worked with Barrow’s opposition coalition, told MTV News.

As campaigner Jeffrey Smith explained: “Jammeh faced such a surprising groundswell of support for the opposition that they couldn’t fudge the numbers to the point where they could make it credible that they won.”

Instances of dictators losing their own ‘window dressing’ election are rare. But there was a perfect storm of various factors that turned the tide in Gambian opposition’s favor, said Jeff Smith, founder of Vanguard Africa.

“What happened is unity,” said Jeffrey Smith, founder of Vanguard Africa, a political consultancy and nonprofit group that supported Mr. Barrow in the campaign. “That is precisely what is needed to take down highly entrenched regimes.”

Celebrations kicked off yesterday afternoon in the small west African state after Yahya Jammeh conceded to Adama Barrow in an unprecedented move for a Gambian head of state.

“This is absolutely momentous for Gambia,” said Jeffrey Smith. “[It is] a stunning rejection of abuse, of dictatorship. Thousands of people bravely put their lives on the line to oust someone who had abused them with impunity for decades.”

“It’s still a tense situation. We're not yet out of the woods. People are in the streets celebrating,” says Jeffrey Smith, a human rights activist and executive director for Vanguard Africa, a Washington-based nonprofit that worked with The Gambia's opposition coalition.

"(Barrow) was absolutely thrust into this position," said Jeffrey Smith, founding director of the advocacy group Vanguard Africa. "He took hold of that leadership and played a seminal role in rallying the disparate opposition leaders around him."

Jeffrey Smith, a human rights activist and founding director of Vanguard Africa, a US-based group which worked with the opposition coalition, said that if Mr Jammeh “can be defeated at the ballot box ... then anyone can”.