Sacramento County’s elected officials laid off 300 employees Tuesday, which brings the total number of layoffs to more than 700 since July, according to county spokesman Zeke Holst. Susan Peters, chairwoman of the Board of Supervisors, said at the Tuesday board meeting that the layoffs were needed in response to the ailing economy. In her comments, she foreshadowed possible upcoming layoffs to address the county’s $76 million shortfall. “I honestly don’t think that this is the last time you’ll see us back here with position reductions,” Peters said. “And we may be able to tweak a few things next week, but it’s not going to be very much, if anything,” she added. “I’m sorry the economy is