Add another pressing challenge to President-elect Barack Obama's growing to-do list - tamping down a dramatic rise in violence and corruption that has overwhelmed the U.S.-Mexico border and spread an escalating turf fight between warring drug cartels into the United States. Near-daily shootouts and ambushes along the southwestern border pose a serious threat, according to separate government reports, which predict a rise in "deadly force" against law enforcement officers, first responders and U.S. border residents. Even President Bush, during a Dec. 21 interview with The Washington Times, warned that Mr. Obama faced a looming war with drug cartels where "the...