[Brilliant]

I want to increase the size though. Add Democrat areas to it, which would turn VA and MD red. Also, I would add a provision that says Congress cannot provide any financial aid or benefit to the New Columbia state unless the same benefit is provided to every other state on a per capita basis.

[scrabblehack]

There would be a seat of the government encompassing White House, Capitol, SCOTUS, etc. - can’t be any larger than 100 sq mi. - no matter how small it got it would still retain 3 EV unless you passed a constitutional amendment.

Then a new state running from Baltimore to Prince William County - New Columbia? Marva? It looks like it would take in at least 7 US House seats (4 from MD - Montgomery, Prince George, Baltimore, and a connector; 2 from VA plus old DC would get one)

Then Old Maryland - 4 US House seats at the most.
Then Old Virginia - 8 or 9 US House seats

Your idea would require a constitutional amendment.
The above plan would require only Congressional approval plus MD and VA legislatures.