The Los Angeles School District -- the second largest in the nation -- has voted to send layoff warning notices to more than seven thousand workers, including four thousand teachers. The School Board vote was 5-2. The exact number of layoffs won't be determined until an expected June vote on Governor Jerry Brown's plan to extend several temporary taxes. The number will also be affected by the outcome of negotiations between the LAUSD and teachers over furloughs and health care costs. Dan Fritz reports from Los Angeles.