介绍:
Newly minted Democratic White House nominee Joe Biden said US President Donald Trump has "cloaked America in darkness for much too long”.
The former US vice-president said his rival has unleashed "too much anger, too much fear, too much division”.
His impassioned speech was the capstone of a political career spanning nearly half a century. Mr Biden, 77, heads into the general election campaign with a clear lead in opinion polls over Mr Trump, 74.
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