Platner's voters are reeling as Maine Democratic Party races to choose his replacement

Maine Senate hopeful, Democrat David Costello, speaks with a potential voter as he gathers signatures, required to be considered at the party

Graham Platner generated enthusiasm in Maine with his progressive policies. Now he's out of the race, and his supporters have to decide what's next, as Maine Democrats prepare to choose a nominee.

(Image credit: Tamara Keith/NPR)