A national primary would disenfranchise large portions of the country, as candidates would be forced to court the support of only the most populous states as they currently do in the general election. At least with the primary system as it stands, candidates have to pay attention to all of the states and all sections within the party.  Staggered primaries create a relationship of interdependence between the nomination campaigns that are run in various states. A poor showing in one state can undermine a candidate’s attempts to make gains in the following state. American political culture is much more fragmentary and heterogonous than European conceptions of the Union might lead us to believe. Each state is sufficiently large that what may seem to be a parochial “local” issue within the context of the entire Union may be of vital importance to a particular state’s voters. The protection and promotion of the politically and cultural plural nature of the states of the Union is a key aspect of the American democratic ideal. It is appropriate, therefore, that blunders in one state’s primary campaign should be open to analysis by the citizens of other states. If a president does not have a commanding understanding of the issues affecting one state, he may be unable to make effective decisions on the rights and affairs of other states.  It is also worth noting that a single national primary would also be likely to disenfranchise those who do not closely and continuously involve themselves in the political process. Staggered primaries lead major national news services to focus on the local-level issues that may affect turnout and voting in individual states. Staggered primaries allows for reflection on these regional issues. Coverage of this type brings local controversies onto the national stage and fosters cohesion and understanding between the constituent states of one of the largest federal republics in the world. However, a one off election would just deliver national totals and even where this is broken down on a state-by-state basis, there will be much less of an understanding of why certain states supported certain candidates. Only political obsessives will are likely to expend time and effort contextualising and understanding this data; the majority of the population will be less informed than under the status quo.