No, it would need the Party's to reform themselves. Each state can simply pass a law setting when and how their Primary elections are conducted. Guess who runs State Govt? Party politicans who hope to more up to National office some day. So you culd do it without a Consitutional Amendment but it would require the States, and The Party Leadership, to cooperate. However that requires the Party bosses to give up their ability to infuence the process. Especting enlighted leadership for Politicans is a bit much to ask. Average people, especially Freepers, need to get massively involved in politics. Espeically if they can win office, they can gain access tot he levers of party leadership. Then they can make some of the changes we talk about here happen. Sitting around just talking accomplishes little. We have to actually take are party back starting at the grass roots.
Having a National Primary Day would require something more than for all the 50 states to voluntarily cooperate, because they WOULDN’T! I am sure New Hampshire and Iowa and probably SC love their “early” status. The 50 states simply will NOT all cooperate.
But I believe a National Primary Day would be a good thing for the country. I don’t think “Momentum” is a serious quality for a great President, but it’s running our campaigns.