Biden faces a cash gap with Trump. He has to close it virtually.

Joe Biden is working the phones with top donors while cloistered in his Delaware home. His digital team is searching for the right tone to ask small contributors for cash during the sharpest economic downturn in their lifetimes. And his finance operation is plotting how to keep the checks coming when catered parties for big contributors are on hold — indefinitely.Top Biden fundraisers and donors, as well as campaign, super PAC and Democratic Party officials, described urgent efforts to rei