USC Gould School of Law thinks Washington, D.C. is:

A) A state
B) Delaware
C) All of the Above

Behold:
























Image scanned by me, Sarah, from page 33 of the 2009 USC Law School Catalog. Note how, in the part I circled in red, they marrooned-in Delaware and labeled it D.C.

D.C. already has Marylanders and Virginians to contend with. I'm sure Delaware doppelgangers are the last thing they want. But if Delaware wants some of D.C.'s inauguration crowds, I'm sure they can have them, gladly.