SAN FRANCISCO - Gov. Arnold Schwarzenegger filled a four-month-old vacancy on the influential California Public Utilities Commission on Monday by appointing John Bohn, a fellow Republican with a diverse background in finance, law, technology, public relations and the government. Bohn, 67, is expected to be sworn in before the PUC's Thursday meeting, giving the state's top energy and telecommunications regulator a full slate of five commissioners for the first time this year. Schwarzenegger picked Bohn after a previous appointment of another Republican businessman, Steve Poizner, fell through. Poizner was never sworn in to the PUC because he held telecommunications investments...