What an ignorant statement. DC has a lower population than North Dakota, South Dakota, Montana, Alaska and Delaware, all of which have 3 electoral votes. And, yes, while they pay the same tax rate as the rest of the country which is presumably what you mean by paying 100% taxes, they also have, by far, the greatest ratio of federal dollars received per tax dollar contributed.
Nobody else is even in the same league.
As for me, I would be willing to contribute a dollar or three like the presidential election campaign check-off to the state of Maryland to approve DC's retrocession just so I wouldn't have to listen to any more whining.
I think you are wrong about DC having the greatest ratio of federal dollars received per tax dollar contributed, but will have to research that and get back to you.
According to the site below, in 2005 DC paid $5.55 to the Federal Government for every dollar it got back. This was 2 1/2 times the ratio for New Mexico which got back$2 for every dollar paid in. I don’t have time to look for more recent figures, but don’t think things have changed all that much since 2005.