Why choice of running mate matters more than usual this year

For all the secrecy and speculation that typically surrounds the search for a vice presidential candidate, the decision rarely sways an election. At a minimum, the decision will shift the force of the campaign — at least temporarily — away from Donald Trump's turbulent presidency onto Biden himself. More fundamentally, the choice offers Biden an unusual opportunity to unify a party still reeling from Trump's 2016 win and solidify its future.