Hillary Clinton has issued a call to retroactively seat the delegates from Michigan and Florida that were ousted for holding their primaries earlier than allowed. She does so in the language of party unity: “I believe our nominee will need the enthusiastic support of Democrats in these states to win the general election, and so I will ask my Democratic convention delegates to support seating the delegations from Florida and Michigan. I know not all of my delegates will do so and I fully respect that decision. But I hope to be President of all 50 states and U.S. territories,...