Must-win Pennsylvania trending to Biden

As attention lingers on the close races in Nevada, Arizona and Georgia, the remaining uncalled state with the most electoral votes – Pennsylvania – is trending rapidly towards Joe Biden. 

The Democrat will win the White House if he picks up Pennsylvania's 20 votes, even if Donald Trump wins Nevada, Arizona, Georgia and North Carolina. 

The incumbent president's lead has fallen from over half a million votes to under 100,000 as early votes are counted: if the trend continues, Biden will be on course for a comfortable win in the state of his birth that will push him beyond the 270 electoral votes needed to take the White House.