Cory Booker joins a crowded 2020 race

Sen. Booker speaking at a press conference in the U.S. Capitol advocating for passage of flood insurance legislation, March 8th, 2016. Photo courtesy of Senator Cory Booker

There are so many Democrats wanting to be president in 2020. Cory Booker is the latest to announce. We analyze the field so far and what major themes have emerged that could influence the race.