-
Now Playing: What you need to know about Election Day 2020
-
Now Playing: Joe Biden speaks to voters in Philadelphia
-
Now Playing: How Joe Biden and Kamala Harris won a historic election | FiveThirtyEight
-
Now Playing: Kamala Harris speaks to Joe Biden on the phone after historic win
-
Now Playing: Joyous celebrations in the streets of Pennsylvania
-
Now Playing: President-elect Joe Biden releases statement after winning White House
-
Now Playing: Joe Biden is set to become the next president of the U.S.
-
Now Playing: Trump speaks publicly for 1st time in days as Biden eyes transition
-
Now Playing: By the Numbers: The 2020 vote count
-
Now Playing: President Trump in legal, financial jeopardy after leaving office
-
Now Playing: Rep. Lucy McBath: ‘Lots of hope because women are getting things done’
-
Now Playing: Trump addresses nation without conceding election
-
Now Playing: Trump addresses nation for 1st time since Biden projected winner
-
Now Playing: Your Voice: Voter reactions
-
Now Playing: Presidential transition turmoil
-
Now Playing: The Breakdown - 1st time Georgia has gone blue since 1992
-
Now Playing: Wyoming’s 1st female senator-elect says Trump shouldn’t concede despite vote count
-
Now Playing: Joe Biden's future chief of staff has battled pandemics before
-
Now Playing: President-elect Biden expected to win Arizona as Georgia’s recount begins
-
Now Playing: ABC News Live Update: President-elect Biden projected to win Arizona