The reason they print that on their license plates is because DC doesn't have a representative in the US Congress, even though they pay federal income taxes in the district. There is a delegate - Elanor Holmes Norton - but she (THANK GOD!) does not have a vote. DC has no vote in the US Senate, either (another good thing). DC residents can, however, vote in presidential elections.
Can you imagine what kind of person that DC residents would elect to be their senators? Probably Jesse Jackson and Marion Barry. LOL! Obviously, this is one reason that many Democrats favor DC statehood - three additonal Democrat seats on Capitol Hill {1 House, 2 Senate}; not because it might actually favor any of their citizens.
:nerd:
DC is a nice place to visit - but I doubt I would ever want to live there. DC officials (from the mayor on down to city council members) harbor contempt for the Second Amendment and our rights as free citizens to defend ourselves; so I doubt any other part of the US Constitution mean much to them, either.
:sniper:
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"A man with a gun is a citizen. A man without one is but a subject."