An idea whose time has probably come, but is almost certainly not original here

A history professor of mine recently shared with the class that he believes there ought to a national primary day, where this six-month process would take place in the space of a single day, roughly approximating the conditions of a general election. He thought this would reduce the relevance of Iowa and New Hampshire, which he described as 'America likes a winner.'

He also argued that delegate apportionment - whether proportional to percentage of the popular vote or winner-takes-all - ought to be consistent with the general election.

Another professor of mine made essentially the federalism argument in rebuttal when I brought the question up to him - that local state parties should and do have the wherewithal to decide when primaries are held, relative at least to the RNC and DNC.

I tend to agree with the former. I see more positives than negatives in a national day of primaries.