Biden joins Harris at first joint election campaign stop since leaving reace United States President Joe Biden has appeared at a campaign event with vice president and Democratic nominee Kamala haris for the first time since dropping out of the presidential race the pair spoke at a rally in Pittsburgh Pennsylvania on Monday to Mark the Labor Day holiday they hope to shore up support from unions and bluecar workers Pennsylvania is considered a key Battleground in 5th November election in which Harris will face off with former president and Republican candidate Donald Trump