On this video, Dee Garrick, who marched with Dr. Martin Luther King, says no: "It's not about civil rights. Racism was about civil rights. This is about society, our future and our children."
Watch and see if you agree with Ms. Garrick.
Update: Here's a related report: "Over 1000 Congregations Represented, Black & Hispanic Clergy Hold Press Conference To Say YES on 8, "Our Children Have Civil Rights Too." One of the highest ranking African American religious leaders in California and in the country has endorsed YES on Prop 8."