[s17n]

It's a nice attempt, but capping the county population at 60000 means the map is effectively ignoring the majority of the population (if you consider the number of "ignored people" to be the sum over all counties of the county's actual population minus 60000)

[aabhay]

It’s only capping the saturation, so that counties with > 60000 residents are shown in brightest color. The color itself though still varies from red to blue based on percentage vote margin. In my mind, this is a great tradeoff, with the only exception that dark Grey counties (large counties with roughly 50:50 split) are way more important than they look since humans tend to de emphasize greys. I would have preferred a brown or something. Purple is not used as it has an imbalanced perceptual effect.

[s17n]

Right, so basically everybody above the 60000 cap is ignored. Basically the difference between a county with 30000 and 60000 is a lot less important than the difference between a county with 60000 and 600000 - this map is truncating most of the population.