For those who have paid both Social Security and State Retirement programs, these sites are worth looking at: 

WEP, GPO, and Bill to Eliminate Them Has Advanced for First Time

WEP and GPO have deprived public servants of their full Social Security benefits for far too long. Federal workers, teachers, police officers, firefighters and others earned pensions through their service, and earned Social Security benefits separately through their or their spouses’ private-sector—or other covered—employment.

Another Source of Information on this topic: 

"A bill to repeal two largely unpopular rules affecting some public sector workers’ ability to collect Social Security benefits was reported out of the House Ways & Means Committee today. The Social Security Fairness Act was introduced by Rep. Rodney Davis (R-IL), and currently has more than 290 cosponsors from both parties."  (more on website)