Same sex marriage advocates believed that public opinion has shifted and tried to circumvent additional Prop 8 appeals by getting the issue back on the ballot and having people vote for it. They could not get enough signatures to qualify.
"They" didn't even try because of the Prop 8 legal challenge. It's a small splinter group "Love, Honor, Cherish" that you are thinking of, not the primary Equal Rights groups of the state. The decided not to pursue a repeal while the legal case(s) were pending.
If you think that serious repeal attempt in California couldn't collect a little over 800,000 signatures when 6,401,482 voters voted to reject Prop 8 then you are either being disingenuous or fail to understand context.
All while ignoring the fact that Same-sex Civil Marriage won at the polls during the general election last year in 4 states with 3 approving outright marriage equality and 1 rejecting the inclusion of discrimination in their constitution.
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