Joe Biden formally clinches Democratic presidential nomination

Joe Biden formally clinched the Democratic presidential nomination Friday, setting him up for a bruising challenge to President Donald Trump that will play out against the unprecedented backdrop of a pandemic, economic collapse and civil unrest.

Curfews, pandemic test voters in primaries held amid unrest

Voters navigated curfews and health concerns in a slate of primary contests on Tuesday that tested the nation's ability to host elections amid dueling crises and moved Joe Biden closer to formally clinching the Democratic presidential nomination.