Democratic presidential candidate Kamala Harris initiated a $50 million advertising campaign on Tuesday, leveraging the momentum of her emerging campaign against Republican opponent Donald Trump with a one-minute commercial titled "Fearless". This marks Harris's first significant ad purchase since consolidating support for the Democratic nomination after President Joe Biden withdrew from the race on July 21 and endorsed her. Harris has not only secured the financial backing of major donors but has also invigorated groups such as young voters, whom Biden had found challenging to attract. Recent public opinion polls indicate that Harris, 59, is narrowing the gap with 78-year-old Trump, who continues to lead in some national surveys. The advertisements will be broadcast on television, as well as on streaming and social platforms, in key battleground states in the weeks leading up to the Democratic National Convention starting on August 19. The initial ad in the series features images of Harris from her childhood, tracing her journey to becoming a prosecutor, attorney general, and US vice-president. "The one thing Kamala Harris has always been: fearless," the ad proclaims. Since assuming her new role, Harris has concentrated on Trump's felony convictions in a hush-money case involving a porn star and other criminal charges he faces, portraying him as the architect of a wave of anti-abortion measures in Republican-controlled states across the country. Harris's ad campaign significantly outpaces the $10 million advertising purchase announced by Trump's campaign on Monday, set to launch in six battleground states this week in an attempt to counteract the surge in voter enthusiasm and donations for Harris. This was Trump's largest ad buy since January.