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Former U.S. Vice President Joe Biden attends a rally in Philadelphia May 18, 2019. Joe Biden on Saturday kicked off his running campaign for the 2020 presidential election in Philadelphia. (Xinhua/Liu Jie)
Former U.S. Vice President Joe Biden attends a rally in Philadelphia May 18, 2019. Joe Biden on Saturday kicked off his running campaign for the 2020 presidential election in Philadelphia. (Xinhua/Liu Jie)