More Census graphs! (showing higher political polarization by county population growth rates)

Here's a fun post combining new Census estimates with political data

I shared the following graph of the relationship between county-level population change and swing in Democratic presidential vote share in last Saturday’s subscribers-only thread:

Today I want to dig into this a bit more, mainly by showing the data relative to 2008 levels too.

But first, some context. Points on a graph are fun and all, but what are we rea…