A 51st State? And not Puerto Rico?

I've been suggesting this for years, but now it seems - according to the State Journal-Register - a couple of Illinois legislators have the same idea:

DECATUR — Two Republican Illinois lawmakers say Chicago-style politics are dominating the state and they have a solution. 

State Reps. Bill Mitchell of Forsyth and Adam Brown of Decatur have proposed separating Cook County from Illinois and creating a 51st state [more].

Even so, I don't expect this will get very far.