Eight states will have just under half of the total population of the country, 49.5 percent, according to the Weldon Cooper Center’s estimate. The next eight most populous states will account for an additional fifth of the population, up to 69.2 percent — meaning that the 16 most populous states will be home to about 70 percent of Americans.

Geographically, most of those 16 states will be on or near the East Coast. Only three — Arizona, Texas and Colorado — will be west of the Mississippi and not on the West Coast.

Ornstein’s (and Waldman’s) point is clear: 30 percent of the population of the country will control 68 percent of the seats in the U.S. Senate. Or, more starkly, half the population of the country will control 84 percent of those seats.

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His tweet goes further, suggesting that the demographics of those states will differ from the larger states, as well, and, therefore, so will their politics.

It’s self-evident that the 34 smaller states will be more rural than the 16 largest; a key part of the reason those states will be so much more populous is the centralization of Americans in cities. It’s true, too, that this movement to cities has reinforced partisan divisions in a process called the Big Sort.

The Weldon Cooper data, though, is less stark on the age differential. Eleven of the 16 most-populous states will have over-65 populations that are below the median density nationally. Twenty-two of the 34 less-populous states will have over-65 populations that are over the median density.

In the current political context, older voters means more Republican voters. By 2040, though, those 65-year-olds will be Generation X, a generation that currently skews more Democratic than the two generations that preceded it, according to a March study from the Pew Research Center. By 2046, even some millennials — a group that is much more Democratic-leaning — will be at retirement age (!!!).

With an important exception, to Ornstein’s point: White male millennials are the only demographic group within that generational bracket to lean more heavily to the Republicans.

So the partisan ramifications of the uneven distribution of the country’s population aren’t clear. But the possible anti-democratic effects of the lopsided Senate are. The gray states on the map below — states that make up more than two-thirds of the land area of the United States — will similarly control enough of the Senate to overcome any filibuster.