In a recent column, I noted that for all the upheaval of the 21st century, 43 states voted the for the same party’s presidential candidate in 2024 and 2000. “That’s remarkable stability,” I wrote. “Only 25 states had voted for the same party in the 1976 and 2000 elections.”

I picked those three elections to compare because they were all relatively close, thus giving a sense of underlying alignments undisturbed by landslides.

Reader Tom Terwilliger has done a more........

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