Washington, DC residents have already voted a few years ago on a draft Constitution, 70% approval. Has a DC bill been entered yet? The PR votes are much more subject to interpretation.
DC can’t be made into a state. The Founders were pretty clear about that, and when they did the dog and pony last year, they even tried to limit the definition of DC to just include the WH, Mall, Capitol Hill, and SCOTUS, but as I understood it, the actual territory of DC is outlined and cannot be changed without amending the Constitution.