Sen. Barack Obama has not yet officially said he is running for president, but supporters in Silicon Valley are already preparing to help pay for his bid. Tech-savvy politicos in the wealthy California region have formed a political action committee backing the Illinois Democrat and are planning a major local fundraiser for next month. The Obama for America Draft Committee PAC, created by San Jose Democratic consultant Jude Barry, raised $30,000 in December. Organizers say the phone is ringing off the hook from potential contributors and volunteers. Obama, 45, formed an exploratory committee earlier this week for a 2008 presidential...