The heavy black turnout for Barack Obama in the presidential race in 2008 was a major factor in the passage of Proposition 8 that year. Black voters sided heavily against same-sex marriage, as these maps of Los Angeles County precincts indicate. At the time, Obama did not support same-sex marriage, but he has since changed his position. Polling indicates that opinion among black voters has shifted as well. Several polls have shown that a substantial majority of California voters now support marriage rights for same-sex couples.
To see how wide the difference was in actual votes, view the map by "Margin of victory." To see the breakdown city by city click here.
Data and cartography: Ben Welsh, Thomas Suh Lauder | Flash: Sean Connelley