"(Note for the chart purists out there: the time units on the X-axis are not linear, even though they are shown as such. They reflect the dates of the previous eight polls, not identical time spans on the calendar.)"

Then you should fix it. Showing a chart with an evenly spaced grid, even though the values on one axis aren't evenly distributed, is just plain wrong. Slopes will be steeper or shallower than they ought to be.

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