New Obama Voters And Prop 8:
The massive black turnout was the critical factor. And Obama's refusal to take a firm stand in the last few weeks of the campaign was instrumental to its passage:
Historically, black Californians have voted in about the same proportion as their population, in the 6 percent to 7 percent range, while Latinos, although more than a third of the state's population, have been about 13 percent of voters.
Last week, however, 10 percent of voters were African American while 18 percent were Latino, and applying exit poll data to that extra turnout reveals that the pro-Obama surge among those two groups gave Proposition 8 an extra 500,000-plus votes, slightly more than the measure's margin of victory.
Black liberals were the critical voting bloc. Jewish liberals voted overwhelmingly against Prop 8, to offer a simple contrast. Obama has always opposed marriage equality, even splitting with his own church on the issue. In California, he got his way.