US President Barack Obama faced a host of personnel problems this week, as two top appointees bowed out because of unpaid income taxes and another pick distressed some in the Jewish community. Slideshow: Pictures of the week Samantha Power, a Harvard University genocide expert and former Obama campaign adviser, has been appointed to the the National Security Council's multilateral institutions office. She has been criticized in the past for making statements critical of Israel and its treatment of the Palestinians. In one clip making the rounds courtesy of YouTube, Power accuses Israel of "major human rights abuses," though she distinguishes...