SACRAMENTO Gov. Arnold Schwarzenegger vetoed a bill Wednesday that would have barred textbooks from using language that would be discriminatory to gays, saying the state's education laws already prevent discrimination. The bill's author, state Sen. Sheila Kuehl, called the veto "inexplicable." Kuehl's bill initially would have required California's social science textbooks to include the historical contributions of homosexuals, but the state Assembly amended it at her request in an effort to avoid a veto from the Republican governor. The final version of SB 1437 would have prohibited any negative portrayal of homosexuals in textbooks and other instructional material, expanding current...