The shared work space in a suburban office park just across the street from the University of California Irvine bustles with young employees walking between glass-walled conference rooms with purpose. Some work for tech startups, like a virtual photo booth company. Others work for a gum ball machine distributor. And still others work for another new type of startup that Orange County hasn't seen in recent years: A serious and professionally run Democratic congressional campaign. For generations, Orange County has been the bastion of Western conservatism, the foundation on which Republicans such as Richard Nixon, Ronald Reagan and Pete Wilson...