Michelle and Barack Obama gave resounding endorsements of Kamala Harris on Tuesday night at the Democratic National Convention, exhorting party supporters across the US to turn out and vote to defeat Donald Trump in November.

“Hope is making a comeback,” Mrs Obama told the crowd at the DNC in Chicago, echoing her husband’s campaign promise of “hope and change”.

In their back-to-back speeches, the Democratic Party’s most popular figures praised Ms Harris, while criticizing Trump – whose presidency was characterised by “bluster and chaos”, in the words of Mr Obama.

However, the Obamas also warned their party not to lose sight of what remains an extremely tight race amid the enthusiasm for Ms Harris’s campaign. They stressed the election would be decided in a handful of key swing states.

“Make no mistake, it will be a fight,” said the 63-year-old former president Mr Obama.

Michelle Obama, 60, stressed the point further. “We need to vote in numbers that erase any doubt,” she said. “We need to overwhelm any effort to suppress us.”

Mr Obama emphasised America’s preparedness for a ‘new chapter’, adding: “We are ready for a President Kamala Harris. And Kamala Harris is ready for the job.”

The Obamas’ appeal to Democrats to turn out in November exposed deeper party anxiety about the narrow race between Ms Harris and Trump, who retains a tight hold on his loyal base of supporters across the country.

Ms Harris has a narrow lead in national polling averages but pollsters caution that the race remains a virtual tie in the handful of battleground states that will ultimately decide who wins under America’s electoral college system.

Though Ms Harris is technically the incumbent candidate, she has described herself and her running mate, Minnesota Governor Tim Walz, as the underdogs in the race.

The Obamas also acknowledged the renewed sense of excitement within the party since Ms Harris replaced President Joe Biden following his exit from the race – making a tacit reference to the enthusiasm and message of hope that powered Mr Obama to victory in his 2008 presidential run against Republican John McCain.

Mr Obama also went on to serve a second term, before Trump won the White House in 2016.