That is, there's movement away from identifying as centrist or moderate to either extreme, and more of that movement is to the left end of the spectrum. These results are fairly robust, see for example the GSS, using WORDSUM as a proxy for intelligence (it is highly correlated with IQ).

When taking into account that we are likley to be not just ideologically more extreme than average but also more divided (than say a random gathering of the "highly educated") since many of us here are metacontrarians, it seems like a very good idea to strictly adhere to the "no mindkillers" rule on political discussion.