Biden's lessons learned: spending time, money in Midwest

Democratic presidential candidate former Vice President Joe Biden speaks at Michigan State Fairgrounds in Novi, Mich., Friday, Oct. 16, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden speaks at Michigan State Fairgrounds in Novi, Mich., Friday, Oct. 16, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden speaks at Wisconsin Aluminum Foundry in Manitowoc, Wis., Monday, Sept. 21, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden greets children outside of the Wisconsin Aluminum Foundry in Manitowoc, Wis., Monday, Sept. 21, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden speaks at Michigan State Fairgrounds in Novi, Mich., Friday, Oct. 16, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden speaks at Michigan State Fairgrounds in Novi, Mich., Friday, Oct. 16, 2020. (AP Photo/Carolyn Kaster)

Democratic presidential candidate former Vice President Joe Biden talks with workers as he tours the Wisconsin Aluminum Foundry in Manitowoc, Wis., Monday, Sept. 21, 2020. (AP Photo/Carolyn Kaster)