Barack Obama took aim at Donald Trump for complaining about HIS problems over the past nine years. #dnc #kamalaharris #election #politics #kamala #kamala2024 #vicepresident #harris2024 #democrats #democrat #trump #vote2024 #harris2024 #timwalz #walz #harriswalz #trump2024 #kamalaharris2024 #obama #barack #barackobama