Maine Gov. Janet Mills suspended her Senate campaign on Thursday, acknowledging she lacked the financial resources to win. Why it matters: Senate Minority Leader Chuck Schumer (D-N.Y.) worked hard to convince Mills to jump into the race. But she was outraised and outpolled by progressive insurgent Graham Platner. Mills' exit clears the way for Platner to become the Democratic nominee against GOP incumbent Sen. Susan Collins. This is a breaking news story and will be updated.