The now-notorious Proposition 8 was put on the ballot by a group of activists intent on banning California's newly proclaimed gay marriages. Thanks to the state's history of ballot initiatives, the state's voters were allowed to express their feelings about the court's decision.
The Mormon Church became the most active participant in the "Yes on 8" campaign. The church found itself on the defensive for its political involvement, and some Mormon-owned businesses were targeted for boycotts.
But the passage of an anti-marriage amendment in neighboring Arizona was perhaps even more heartbreaking, because the state's citizens had previously voted down just such a measure--the first (and thus far, only) time an American electorate had done so.