Hillary Rodham Clinton has hired a longtime Google executive to oversee her likely presidential campaign's technology development and build new ways for Clinton to engage with voters, according to Democrats with knowledge of the move. Stephanie Hannon, who is Google's director of product management for civic innovation and social impact, will become the chief technology officer of the expected Clinton campaign, according to the Democrats, who spoke on the condition of anonymity because they were not authorized to discuss the appointment. At Clinton's New York campaign headquarters, Hannon will serve on the senior staff and oversee a team of engineers...