You got that right. When Thurgood Marshall was nominated for the Supreme Court back in 1967, over 90% of Republican Senators voted in favor of his nomination while only 58% of Democrat Senators voted in favor. Go figure.
From its very beginning and its early support for slavery the Dem party has been the party of racism. Jim Crow was Democrat policy. Woodrow Wilson and his segregation policy were Dem ideology, the leftist goal of abortion is racist in its origin, the Dems opposed the Civil Rights Act in 1964, and as you said, opposed Thurgood Marshall, and they are racist to this day.
I only wish that every African-American in this country understood those facts.