Houston Mayor Bill White used a Web video to announce his plan to run for U.S. Senate today.... He cites turbulent economic times, a rising federal deficit and high unemployment rates in the video, saying "this may be an opportunity for our nation to do things it has only dreamed of before..." White previously worked as deputy secretary in the U.S. Department of Energy under President Clinton and as chief executive of the Wedge Group, a Houston-based holding company with interests in oil-field services, engineering and real estate. In comments today, he also highlighted signature domestic issues such as health...