QALQILIYA, West Bank - In the nine months since Hamas won control of Qalqiliya's town council, it says it has balanced the budget and rooted out corruption. Yet residents were not satisfied, and in a stunningly swift change of heart voted for candidates of the rival Fatah Party in last month's parliamentary election. Hamas' defeat in Qalqiliya — in contrast to its landslide victory just about everywhere else in the West Bank and Gaza — highlights the obstacles ahead as the militant group tries to rule an impoverished, impatient population. Meeting voters' expectations will be even harder if Western nations...