The Democrat has a solid national lead over the Republican president six days before the 3 November election.
But Mr Biden's advantage is narrower in the handful of US states that could vote either way and ultimately decide who wins the White House.
The Democrat has a solid national lead over the Republican president six days before the 3 November election.
But Mr Biden's advantage is narrower in the handful of US states that could vote either way and ultimately decide who wins the White House.