Well, I hate to say it, but yes we have. All the time Bill Clinton was President.
FYI, while reading Federalist Paper No. 51, I came upon James Madison's reference to our government as a "Compound Republic". I am sure the meaning of this term is not lost on the inhabitants of FreeRepublic. Not only are we "republics" at the federal level, so are we "republics" at the state level as well. The term Compound Republic must be difficult for a progressive socialist to comprehend.