During the Progressive era, many politicians began to feel the need for a national primary system. Such a system would involve holding all presidential primaries on the same day - as opposed to the current system where the primaries and caucuses are held over a period of many months. In 1915, President Wilson supported this reform in the form of a bill. Ohio Senator Atlee Pomerene disagreed, arguing in favor of a constitutional amendment instead. Neither man's idea won out and ultimately the proposal went nowhere. But what if the US had implemented a national primary system during this period? What impact would this have on presidential elections from 1916 until today?