According to the report, which concludes that the U.S. electorate has become more diverse, 66.2 percent of blacks voted in the 2012 election, compared to 64.1 percent of whites. Hispanics and Asians voted at rates of about 48 percent last year.
The study also shows that blacks and Hispanics have gained a considerable share of the eligible electorate since 1996, while the White share of the eligible electorate has dropped from 79 percent to 71 percent since 1996.
In Oklahoma, the report says, 55.9 percent of whites voted in the 2012 election, while 54.6 percent of blacks voted. However, the survey questions for both races had a margin of error of 3 percent, suggesting the difference was statistically insignificant.
About 55 percent of eligible women voted in Oklahoma last year, while about 50 percent of the men cast ballots, according to the study.