‘Dark money’ overshadows 2020 election political ad spending

Screengrab from an ad by the group One Nation – captured via YouTube More than half of all TV ads

Outside groups pour money into Biden support

(Kyle Rivas/Getty Images) Outside groups are pouring millions into backing former Vice President Joe Biden as he gains momentum with

Warren faces challenge from Sanders in home state despite financial backing

Senator Elizabeth Warren (JOSEPH PREZIOSO/AFP via Getty Images) After failing to make headway in key early primary states, polls suggest

South Carolina donors give the greatest amount to Biden as Sanders cuts into the lead

(Sean Rayford/Getty Images) Former Vice President Joe Biden is placing his bets on a state that is his stronghold, South

Biden dominates with Nevada donors ahead of caucus

(John Tlumacki/The Boston Globe via Getty Images) Democratic presidential candidates who received the greatest amount of  donations from Iowa and