Janet Mills is running for Senate in Maine, setting up one of several midterm Democratic primaries around the country that will test the generational divide in the party. CNN's David Chalian explains. Read more: https://cnn.it/42ESMaS | CNN Politics

Question 2 on the November ballot proposes creating a new path to temporarily confiscate firearms from dangerous people, but the debate over the proposal centers on whether an older, similar law crafted by a prominent gun rights group and Gov. Janet Mills six years ago is enough. Proponents of Question 2 argue that the existing law — often referred to as Maine’s yellow flag law — is a failed experiment that was not used to stop a gunman in Lewiston from killing 18 people and injuring and traumat