Washington DC, two square miles and they get two senators?
Realistically, what should had been done is to return the district to Maryland. Only the Capitol, the White House and the Supreme Court along with a couple of other federal buildings will remain in federal jurisdiction. The population of the remaining district would be zero. Maryland gets an additional representative due to an increase in the population in their state.
Not certain, but I believe the attempt to make D.C. a state would be a violation of the U.S. Constitution - not that that matters anymore.