Kamala Harris' Philadelphia rally was intended as a show of force — bringing celebrity firepower to the biggest city in the most important swing state.

Gaga was joined byDJ Cassidy, Cedric the Entertainer, Fat Joe, Oprah Winfrey and more the night before Election Day in a get-out-the-vote final push from the Democratic campaign.

Lady Gaga endorsed Kamala Harris on social media Sunday (Nov. 3), when it was announced she’ll be headlining the Democratic presidential candidate’s campaign rally in Philadelphia on Monday (Nov. 4), the eve before the election. Katy Perry leads the lineup of the VP’s Pittsburgh rally on the same day.