Are there any east coast restaurant chains I can hit in the DC area?

I know White Castle has no restaurants there. Anything else that I don't have in Oklahoma?Are there any east coast restaurant chains I can hit in the DC area?
Red, Hot and Blue http://redhotandblue.com/

Legal Sea Foods http://www.legalseafoods.com/

Clyde's http://www.clydes.com/main/index.cfm



There are a lot of possibilities. There are also a lot of excellent one-of-a-kind restaurants.
Pot bellies! There all over DC, baltimore, Silver spring, takoma park. It's a sandwich joint. Very unique. Best sandwiches ever :)Are there any east coast restaurant chains I can hit in the DC area?
I'd try '5 Guys' if you don't have them in Oklahoma. They are just burgers and fries, but yummy!

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