Biden, flush with cash, boosts ad spending in battlegrounds
Democratic presidential candidate and former Vice President Joe Biden and his wife Jill Biden depart after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Democratic presidential candidate and former Vice President Joe Biden and his wife Jill Biden depart after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Sep. 14, 2020 09:49 AM EDT
Democratic presidential candidate and former Vice President Joe Biden speaks with reporters as he and his wife Jill Biden depart after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Democratic presidential candidate and former Vice President Joe Biden speaks with reporters as he and his wife Jill Biden depart after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Sep. 14, 2020 09:49 AM EDT
Democratic presidential candidate and former Vice President Joe Biden departs after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Democratic presidential candidate and former Vice President Joe Biden departs after voting early in Delaware's state primary election at the New Castle County Board of Elections office in Wilmington, Del., Monday, Sept. 14, 2020. (AP Photo/Patrick Semansky)

Sep. 14, 2020 09:49 AM EDT