Presented for completeness. Here are the 2015 EV totals from the top 15 counties, and here are the 2013 totals. And here is a handy table comparing the two:
County 13 total 15 total Inc
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Harris 101,694 193,966 90.73%
Dallas 22,119 42,392 91.65%
Tarrant 29,928 42,308 41.37%
Bexar 30,845 42,216 36.86%
Travis 34,672 27,224 -21.48%
Collin 18,506 27,836 50.42%
El Paso 4,864 11,255 131.39%
Denton 12,714 17,888 40.70%
Fort Bend 12,500 21,782 74.26%
Hidalgo 12,391 9,709 -21.64%
Montgomery 6,043 22,606 274.09%
Williamson 12,349 14,574 18.02%
Galveston 4,148 9,236 122.66%
Nueces 12,677 4,099 -67.67%
Total 315,450 487,091 54.41%
Here’s the previous statewide EV post; note that the rate of increase notched up from 51% to over 54%. For all the ballyhoo over how vigorous early voting was in Harris County, it only saw the fourth-largest increase overall. We know about Montgomery and its contentious road bond issue, but I have no idea about Dallas or El Paso or Galveston. Anyway, my point as before is that Harris wasn’t unique – if all these counties have an increase in early voting, for no obvious reason, it seems likely that behavior shifting is a part of it. We know that already from the daily rosters in Houston, but it never hurts to have corroboration.