Unlocking Secret Characters

I beat the game and unlocked most of the secret characters but because another user on my computer tampered with the files I could not play multilayer with them. So I decided to uninstall and reinstall Political Machine 2008 and now I want to get my characters back without having to go though campaign mode all over again.

Is there a way to unlock characters without going through campaign mode and still be able to play multilayer?

Thanks.