Voters in four states—Maine, Nevada, North Dakota and South Carolina—are casting their primary ballots today. The Senate race in Maine, and the Democrat primary in particular, has captured the nation’s attention with Graham Platner’s “scandals du jour.” A former top aide to his campaign published an opinion piece in today’s Washington Post explaining why he is unfit to serve in the Senate. It will be interesting to see how many votes Gov. Janet Mills receives in the Democrat primary against Platner. While Mills suspended her campaign weeks ago, her name is still on the ballot.