Can democracy be amenable to freedom?

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Public choice theory tells us that in order to preserve liberty and the common welfare in a system of representative government there must be strong constitutional protections against government power, a sort of list of matters that are not fair game for debate. Can such a system of limited government still be called democracy? Can such checks of power work--can democracy be made amenable to freedom--or is there no way to save liberty except eternal vigilance and constant struggle?