Colorado is at the epicenter of WEP and GPO impacts. No state workers are allowed to contribute to SS, because then the state would have to contribute their share. Currently, the state pays *less* into the retirement plan than they would pay into SS. They have consistently "deferred" payments to PERA (Colorado employee's retirement plan), and now the plan is way underwater. The state of Colorado would not be able to defer payments to SS, if workers had to pay into SS. PERA is basically insolvent at this point. They won't say the word "insolvent", but the latest independent audit said that if the state government does not immediately infuse $2 Billion into the plan, it is toast.
The bottom line is that anyone currently accepting a job with the state of Colorado, expecting a pension after 25 years, is a fool. It isn't going to happen. And since you are prohibited from contributing to SS, you won't have that, either. If you have already contributed 40 quarters to SS, you *might* get some portion of that, it depends on the outcome of the WEP/GPO repeal.