California’s first-in-the-nation law that requires including the contributions of gays and lesbians in social studies lessons already has drawn a challenge. The secretary of state’s office on Tuesday cleared opponents to begin collecting signatures for a possible ballot referendum seeking to overturn the law. Gov. Jerry Brown signed SB48 earlier this month, making California the first state to mandate teaching of gays and lesbians in public school curriculum. The requirement takes effect in the 2013-14 school year.

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