A lot of media outlets started focusing on black people and the reason Prop 8 wasn't passed because most made the connection that the large number of black people who came out to support Obama in the first election also voted against Prop 8. There were plenty of arguments on GAF with members (including myself vs a "late" GAFFer who will remain nameless out of respect) who tried to make it a black people thing during this time, vs making a connection that most black people are just as religious as republicans.
Besides religion though, I would say there were other factors at play during the whole Prop 8 situation. A big one being pop culture and exposure to gay culture/lack if education about gay culture in black media. While many gay marriage supporters during this time put most of their focus into educating and exposing larger (mostly white) audiences to gay culture and increasing awareness of the issues, these supporters didn't pay much/any attention to the black community, not realizing that our vote was going to play a factor and that it was still "cool" to be anti gay in our community among young people. Take for example the Mr. Cee story that was posted by abuC:
Hip hop culture was (arguably still is) easily one of the most anti gay forms of entertainment in regards to artists/supporters letting the general public know they were anti gay and being popular for it. It's not a surprise that people like Mr. Cee, who's whole lives revolve around this culture refuse to come out, when in large you are either going to be ostracized or made fun of for it by your peers ("I ain't go no worries. No Frank Ocean I'm straight.").
And even with hip hop, you could see how the gay community at large ignored the black community within this smaller communty. I'm sure most of you remember back when Eminem was getting criticized by the gay community for being homophobic. Meanwhile rappers like DMX were dropping "gems" like this around the same time:
And this was pretty normal for the hip hop community. Now most main stream rappers wouldn't get away with stuff like this, but back when Prop 8 was around it would have been helpful if the gay marriage support groups had been paying just a little more attention to the "role models" of black youth at the time and criticizing them the same way.
There's also other factors that played a part IMO, like stories of the "Down Low Brother" and the threat he poses to black women and black house holds, stories that could be killed if more knowledge of gay people was presented to the black community.
Regardless though, arguments that black people hate gay people was silly then and it is still silly now. Maybe if someone had put on a black "Will and Grace" television show before Prop 8 came up or gay supporters had pressured major black figures like Obama to come out in support of gay marriage prior to Prop 8, there would have been more support by black people for the measure.
