Now Playing: What Joe Biden’s Massachusetts win means for Elizabeth Warren
Now Playing: FiveThirtyEight Politics Podcast: How Biden won Super Tuesday
Now Playing: Ending analysis for Super Tuesday
Now Playing: Jeff Sessions aims to win Senate seat
Now Playing: The latest projections for the Democratic primary
Now Playing: Biden projected to win Massachusetts Democratic primary
Now Playing: Biden speaks to supporters at Super Tuesday rally
Now Playing: Sanders projected to win Utah; Biden projected to win Minnesota
Now Playing: Biden projected to win Arkansas primary
Now Playing: Bernie Sanders holds rally on Super Tuesday
Now Playing: Who will win Super Tuesday?
Now Playing: Breaking down the allocation of delegates
Now Playing: Bernie Sanders projected to win Colorado Democratic primary.
Now Playing: Trump continues to sweep Republican primaries and caucuses
Now Playing: Biden projected to win Oklahoma Democratic primary
Now Playing: Biden projected to win Tennessee Democratic primary
Now Playing: Michael Bloomberg speaks at Florida rally
Now Playing: What’s at stake on Super Tuesday
Now Playing: Sanders and Warren battle for the progressive vote
Free America Network Articles