You are a bit confused here. When James Madison criticized “democracy” he meant Greek style democracy. He defined a Republic as simply a government where the people elected their representatives. Thomas Jefferson later translated a book about the new country, by a Frenchman. A. V. C. Destutt Tracy. He translated Destutt Tracy’s term for the new government as “representative democracy,” which stuck and is now almost always what people mean by the term “democracy.”
As to Montana, which did not then exist, Madison argued that no minority should have a veto because it would lead to internal strife. The solution to democratic over-reach was to have decisions require different majorities elected by different means: hence the House which was supposed to be a simple popular majority (which gerrymandering has defeated), the Senate, which required a majority of the states, and the President, which was more complicated and never worked the way they anticipated, but until recently was almost always chosen by a majority of the country.
Currently no Federal institution represents a majority of Americans. The filibuster is basically a bad institution, BUT in this context where the country is split such that part wants to be like northern Europe and part seems more attracted to becoming a Christian version of Iran, the minority of states supporting the filibuster also represents a clear majority of the American people who otherwise are frozen out of a supposed Republic that is no longer one since it is dominated by a clear minority of the people.
Right wingers have destroyed the logic behind our constitution — and they pretend to be conservatives