A new report revealing the staggering extent of fraud in America’s K-12 education system highlights a pair of California school leaders who separately stole nearly $20 million from their schools to bankroll their lavish lifestyles. The two cases were among the costliest cited in the report, which details roughly $225 million in alleged education fraud nationwide amid a furious federal crackdown. A coalition of state financial officers identified nearly 90 cases over the past six years involving embezzlement, phony invoices, inflated enrollment, bid-rigging and kickbacks, among other crimes. California was among the worst offenders of the states analyzed in the…