White Democrats Are Smarter Than White Republicans And Independents

Razib Khan analyzes the data from the General Social Survey (2016 to the present) using a question that is a decent proxy at a statistical level for IQ. It isn't even close among Non-Hispanic Whites:

Liberal Ideology: 20% in the top 10%; 22% in the bottom 30%.

Democrats: 16% in the top 10%; 27% in the bottom 30%.

Independents: 10% in the top 10%; 43% in the bottom 30%.

Conservative Ideology: 9% in the top 10%; 30% in the bottom 30%.

Republicans: 8% in the top 10%; 31% in the bottom 30%.

Moderate Ideology: 8% in the top 10%; 38% in the bottom 30%.