Not a new idea, this. Dropping off the District of Columbia’s residential neighborhoods into Maryland, whence they came, has come up before—usually as a counter proposal to D.C. statehood, that political pipe dream Democrats can’t let go.

For David Krucoff, 50, it’s also a human rights issue. “With two more senators, sure to be Democrats, the Statehood solution continues to crowd out all other solutions despite its widely recognized political mortality,” reads Mr. Krucoff’s proposal for retroceded residential D.C.—what will become Douglass County, Maryland if he succeeds in his mission. “It turns out that the enemy to our equal representation is ourselves.”