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FILE - In this Aug. 4, 2010 file photo, same-sex marriage supporters gather outside a federal building and wait for a judge's decision overturning California's same-sex marriage ban in San Francisco. On Tuesday, the US Supreme Court will begin hearing two days of cases involving gay marriage. (AP Photo/Eric Risberg)

Associated Press
FILE - In this Aug. 4, 2010 file photo, same-sex marriage supporters gather outside a federal building and wait for a judge's decision overturning California's same-sex marriage ban in San Francisco. On Tuesday, the US Supreme Court will begin hearing two days of cases involving gay marriage.  (AP Photo/Eric Risberg)
FILE - In this Aug. 4, 2010 file photo, same-sex marriage supporters gather outside a federal building and wait for a judge's decision overturning California's same-sex marriage ban in San Francisco. On Tuesday, the US Supreme Court will begin hearing two days of cases involving gay marriage. (AP Photo/Eric Risberg)
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