You have chosen to interpret these numbers to mean democrats have higher IQ. You make several more assumptions too. Why is there a shift from Republican dominance to Democrat dominance since 1992? Has the Republican party changed drastically since then? Or are there changes in who is getting college degrees? A majority of men identify republican, who also are the majority in higher IQ fields of study such as physics, mathematics, and science. The lowest IQ level degrees, such as education and social work, are dominated by females, and females of course tend to be democrats. Females comprise close to 60% of enrollment in degree granting post secondary institutions. I am not stating females have lower IQ here, I am stating females make up a larger portion of college students and those students dominate the majors which correlate with lower IQs.http://www.people-press.org/2015/04/07/a-deep-dive-into-party-affiliation/
Differences in partisan identification across educational categories have remained fairly stable in recent years, with one exception: Highly-educated people increasingly identify with or lean toward the Democratic Party.
About a third (34%) of those with a college degree or more education identify as Democrats, compared with 24% who identify as Republicans; 39% are independents. In 1992, Republicans held a seven-point lead among those with at least a college degree (34% to 27%), while 37% were independents.
Democrats now hold a 12-point lead (52% to 40%) in leaned party identification among those with at least a college degree, up from just a four-point difference as recently as 2010 (48% to 44%). There has been less change since 2010 in the partisan leanings of those with less education.
Currently, those who have attended college but have not received a degree lean Democratic 47% to 42%; Democrats hold a 10-point lead in leaned party identification among those with no more than a high school education (47% to 37%).
The Democrats’ wide lead in partisan identification among highly-educated adults is largely the result of a growing advantage among those with any post-graduate experience. A majority (56%) of those who have attended graduate school identify with the Democratic Party or lean Democratic, compared with 36% who align with or lean toward the GOP.
Among those who have received a college degree but have no post-graduate experience, 48% identify as Democrats or lean Democratic, while 43% affiliate with the GOP or lean Republican.
A far more accurate indicator of IQ is income level, and as someone else posted in this thread, Republicans dominate over a certain economic threshold.
