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Look at the data FIRST before pushing line-drawing theories.
Looking at the by-state results gives the impression the far west and northeast should be handed over to Canada.
BUT...
Looking at the by-county results shows that even the blue (liberal) states are mostly red (conservative) by area. Don't eject CA/OR/WA just because a dozen counties there went to the dark side; most of that real estate is occupied by right-leaning rural folk. Even notoriously blue NY and CA are predominantly red, turned blue only by association with high-density blue NYC, LA, and SF.
Looking at the by-precinct results (not available yet, but I recall them from 2000) shows that the blue counties - at least most of them - are themselves mostly red by precinct.
The severly misunderstood issue in "us vs. them" political geography is that the liberal/socialist/leftist/communist/blue votes are very highly concentrated in very small areas. Of some 3,500,000 square miles of this country, only about 50,000 square miles majority votes for socialism! Ergo, if you want to discuss redrawing the "us vs. them" lines and/or outright secession/ejection/war of geographic regions, the real estate involved has a 70-to-1 red-to-blue size difference, with an almost uniformly red USA suffering a few tiny streaks of cancerous blue.
Hence, don't talk about state vs. state conflicts over red/blue left/right R/D differences.
why not begin a national dialog on an orderly separation, perhaps to be phased in over a number of years
Orderly separation of what? The leftists you & I wish to separate from live packed like sardines in a few tiny urban centers. Don't throw away CA just because of LA & SF - by straight acreage, most of CA agrees with you politically! ditto for NY.
The issue is not ejecting states. The issue is dealing with people who choose to live a highly dependent, sardine-packed lifestyle which naturally leads to a dramatically political/social view from the rest of us landowners. Unfortunately, there's about as many of them as of us, but the difference in population density and distribution is rarely considered seriously.
If you want a new theory of "orderly separation", figure out how to draw lines around urban areas and get everyone to understand that those inside urban boundaries do indeed have different socio-political needs from those outside.