Former United States President, Barack Obama has endorsed Democratic presidential candidate Kamala Harris.

Obama who was the 44th US President, gave the endorsement while addressing the party faithful on Tuesday.

He is expected to pay tribute to outgoing President Joe Biden, who served as vice president for eight years.

He used his well-known rhetorical powers to deliver a thundering endorsement of the Democratic presidential nominee, Harris.

Obama, who got his political start in Chicago, has kept a low profile since leaving office in January 2017.

But he remained a broadly popular public figure and one of the most powerful voices on the political left.

Obama was first elected in 2008 and was the first black president in U.S. history, and he was re-elected in 2012.

Harris is the first female, first black, and first Asian American U.S. vice president, who would be another White House trailblazer if she defeats Republican Donald Trump in November.

No woman has ever been US president.

Former first lady Michelle Obama is also set to deliver remarks on Tuesday night, as is Harris’ husband, second gentleman Doug Emhoff.

As the contest enters its last phases, the party hoped the bash would propel Harris into the autumn.

She is due to take to the convention stage for a speech on Thursday night.