The congress critter, nameless here, allegedly has a college degree. The congress person tweeted "Black Americans fled the tyranny of slavery & towards greater freedom, to DC. Yet today it's where 2nd class citizenship reigns, and the right to vote is denied. It's time to recognize DC statehood."
Slavery was legal in the District of Columbia until 1862. Vermont was free in 1777, before it achieved statehood.
People fleeing slavery in 1860 avoided the District of Columbia.