By Stephen Ohlemacher and Will WeissertFriday, June 5, 2020WASHINGTON -- Joe Biden formally clinched the Democratic presidential nomination Friday, setting him up for a bruising challenge to President Donald Trump that will play out against the unprecedented backdrop of a pandemic, economic collapse and civil unrest."It was an honor to compete alongside one of the most talented groups of candidates the Democratic party has ever fielded," Biden said in a statement Friday night, ''and I am proud to say that we are going into this general election a united party."The former vice president has...…By Stephen Ohlemacher and Will WeissertFriday, June 5, 2020WASHINGTON -- Joe Biden formally clinched the Democratic presidential nomination Friday, setting him up for a bruising challenge to President Donald Trump that will play out against the unprecedented backdrop of a pandemic, economic collapse and civil unrest."It was an honor to compete alongside one of the most talented groups of candidates the Democratic party has ever fielded," Biden said in a statement Friday night, ''and I am proud to say that we are going into this general election a united party."The former vice president has...WW…