The current arrangement means that a handful of small states have a massively disproportionate impact on the primary campaigns. A genuinely national primary would even that out. Grassroots campaigns would also have a reasonable basis for operating on the national stage right up to the event.  Stretching the process out ultimately play to the biggest pockets. Unless grassroots candidates get an extraordinary result early, they’re knocked out. Trying to fight their way through several, effectively national campaigns, means that they only really have one chance at the moment.  It’s only sensible to make that fact reality with a structure that means all candidates are in an all or nothing race rather than a financial endurance test.