How an explosive Senate race became a referendum on Brett Kavanaugh (opens in new tab)

Democratic primary was decided in Maine on Tuesday night, incumbent GOP Sen. Susan Collins learned who she would be going up against in the general election: embattled progressive Graham Platner. Some establishment Democrats would have preferred two-term Maine Gov. Janet Mills, who won 18 percent of the vote (compared to 74 percent for Platner) despite having dropped out of the race. But the general election is now officially Collins versus Platner, and according to NBC News reporters Natasha...