WASHINGTON (Reuters) – Democratic presidential candidate Kamala Harris launched a $50 million advertising blitz on Tuesday, capitalizing on the momentum of a fledgling campaign against Republican rival Donald Trump with a one-minute spot titled “Fearless.”

It was Harris’ first big ad buy since consolidating support for the Democratic nomination after President Joe Biden dropped out of the race on July 21 and endorsed her.

In addition to garnering the backing of big-money donors, Harris has sparked newfound energy among groups such as young voters that Biden had been struggling to win over.

Public opinion polls in the last week have shown Harris, 59, closing the gap with 78-year-old Trump, who still leads in some national surveys.

The ads will be rolled out on television as well as streaming and social channels across election battleground states in the weeks before the Democratic National Convention that starts on Aug. 19.

The first ad in the campaign begins with images of Harris as a little girl and follows her progression to a prosecutor, attorney general and U.S. vice president. “The one thing Kamala Harris has always been: fearless,” the ad says.

Since stepping into her new role, Harris has focused on Trump’s felony convictions in a hush-money trial involving a porn star and the other criminal charges he faces, and portrayed him as responsible for a wave of anti-abortion measures in Republican-led states around the country.

The Harris campaign’s ad buy dwarfed the $10 million advertising buy announced by Trump’s campaign on Monday, to be launched in six battleground states this week as it tries to counter a surge of voter enthusiasm and donations for Harris.

That was Trump’s biggest ad buy since January.

(Reporting by Doina Chiacu; editing by Deepa Babington)