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Excel limits each "sheet" to 1,048,576 rows, but there's no limit to how many sheets you can have in a single file. https://support.office.com/en-us/article/excel-specification...

I used to work in this field (political consulting, the data around it, nothing terrible interesting on the tech front at the time though). It was most likely broken down by Congressional district.

It’s provably a CSV not meant to be used by excel.

Correct:

>Each file, formatted as a comma separated value (.csv), lists an internal, 32-character alphanumeric “RNC ID”—such as, for example, 530C2598-6EF4-4A56-9A7X-2FCA466FX2E2—used to uniquely identify every potential voter in the database.

It's plural, spreadsheets. It could be thousands of separate files.

Good catch. According to Microsoft[0], the max number of rows is 1,048,576. So I guess there must have been a couple hundred!

[0] https://support.office.com/en-us/article/Excel-specification...