The most recent in a rash states to do this,
Florida recently moved its presidential primary date up to January 29, 2008. At current count, nearly half of the states will have held their nominating elections by "Super Tuesday," February 5. Why not just hold them tomorrow? And then, come November 2008, we can decide who to elect for the next two cycles, and then get 2016 taken care of by Inauguration Day? This current level of ridiculousness is the result of a game of chicken that's been slowly building for several cycles now to see who can get the most influence in the nominating race.
Now, I'm for states rights as much, and actually a lot more, than most. However, considering that we are talking about the only national office, I think that the time has come to consider some sort of national solution to this problem. There is no rational reason that a republic made up of sovereign states should allow any state, whether it's the most populous or least, any more influence in selecting the parties' presidential candidates.
There are a number of problems with trying to enact a single national primary date. First, as the most extreme option, it would engender the most opposition from the states who would have to ratify it. Second, there is the substantive concern of giving the candidates with the most money the advantage of carrying out a national campaign. Admittedly, money is a form of speech, but a national primary date would essentially eliminate the need for any primary at all, by giving such a big advantage to each parties' "establishment candidate." No John McCain in 2000, no Howard Dean in 2004. Well, that actually doesn't sound so bad, but replace those names with second-tier candidates that you find appealing.
With that in mind, I propose the following Constitutional amendment. In substance, my proposal would mandate that all states' nominating process, be it a primary, caucus, or whatever, be held between 6 and 8 months prior to the date of the general election. In other words, some time in the months of March, April, or early May of the election year. This eliminates the absurdity of the current arms race that has elections being held in January and early February, but still maintains a level of states' rights.
Certainly, there are likely to be problems with this system as well, and I have no delusions of such an amendment being ratified in the foreseeable future. However, hopefully as the system becomes more and more obviously ridiculous as the dates of the primaries get earlier and earlier, more people will come to see things my way and we can come up with some sort of a reformed, national system.