So Boulder- Purple America Has All But Disappeared | FiveThirtyEight

The electorate’s move toward single-party geographic enclaves has been particularly pronounced at the extremes. Between 1992 and 2016, the share of voters living in extreme landslide counties quintupled from 4 percent to 21 percent.

November’s election was an exclamation point — or perhaps a flashing danger sign. Legions of big counties were won in a landslide (by at least 20 points): The counties containing Ocala, Florida; St. Cloud, Minnesota; Utica, New York; Wilkes-Barre, Pennsylvania; and Charleston, West Virginia, were Republican routs for the first time in a generation. Meanwhile, San Diego County, California; Montgomery County, Pennsylvania; and Henrico County, Virginia — all GOP landslide counties in 1988 — became Democratic landslide counties in 2016.

Those examples prove that communities can change allegiances over time. But most places just aren’t budging — in fact, they’re doubling down. In an increasing number of communities like Baldwin County, Alabama, which gave Trump 80 percent of its major-party votes, and San Mateo, California, which gave Clinton 80 percent, an entire generation of youth will grow up without much exposure to alternative political points of view. (So Boulder – Ed comment) If you think our political climate is toxic now, think for a moment about how nasty politics could be 20 or 30 years from now. (Bold added as well-Ed)

The issue is people living in these landslide counties don’t realize there’s another point of view, or if they do, they have no reason to view positions different than there’s as legitimate. As a reminder in the People’s Republic of Boulder the Presidential election results were:

• Clinton: 70.34%
• Trump: 22.0%
• 3rd party: 7.64%

So BoCo just barely escaped the landslide victory category where the margin of victory for the 2 parties was 50% or greater by less than 2%.

Also, pretty soon the candidates will only need to campaign in a few select counties.