New York/Washington — US Democrat Joe Biden’s presidential campaign will blanket television and social media with $280m in advertising by election day on November 3, the campaign announced on Wednesday, more than his rival’s campaign has spent in total since 2017.

The hefty advertising across 15 states marks a sharp increase for the former vice-president, who once struggled to find money during his party’s primary and only aired his first general election ad blitz in June...

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