Argentina and Brazil aren't exactly the best examples of functioning republics though. And when you factor in the fact that the US has been significantly more stable and successful as a nation, I'd say that scores a point for "don't change anything" school of thought. The whole idea of the US was that we are supposed to be a nation that is different from the rest of the world. That's why when someone tries to make an argument like "Country X does this, why can't we?" that person is usually shouted down. Americans don't want to be like the rest of the world, and those that do can be described as being fundamentally unAmerican. The Senate covers the inequities on the legislative side of things, but not on the executive side of things. The idea was that the president is to be chosen by a consensus of the states, not a consensus of the people. Of course that was messed up by the bigger population states demanding a compromise which led to the current system we have. I would reform the Electoral College to have each state have 3 electoral votes regardless of population. Two would go to the winner of the popular vote in that state and one vote goes to the runner up.