Sen. Cory Booker (D-NJ): 19 states + DCVP Tim Kaine (D-VA): 17 states, drops out at the conventionSen. Chris Murphy (D-CT): 14 states, drops out in early AprilThe primaries end with no candidate winning a majority of pledged delegates. Booker has a plurality, and is able to convince superdelegates to support him. Murphy endorses Booker before the convention and tells his delegates to support Booker. Booker wins a majority of delegates at the convention.
Also, the map ends up looking really weird because of strong three-way competition and Murphy dropping out (he would have won CT, RI, OR, MT, ND, and SD if he didn't).