In a 2010 Pew survey, Republicans outperformed Democrats on 10 of 12 questions, with one tie and Democrats outperforming Republicans on just 1 of the 12. In the latest survey, however, Republicans outperformed Democrats on every single one of 19 questions.
Amusingly, the Pew report attempted to soften the stark partisan knowledge disparity:
“Republicans generally outperformed Democrats on the current quiz. On 13 of the 19 questions, Republicans score significantly higher than Democrats and there are no questions on which Democrats did better than Republicans. In past knowledge quizzes, partisan differences have been more muted, though Republicans often have scored somewhat higher than Democrats.”
“Generally outperformed?” “Somewhat higher?” That’s a curiously charitable way to describe the surveys, which went from previous blowouts to a complete shutout in the latest edition.
You can't argue with the results of this survey. The science is settled.