Reuters - Republican presidential contender Rick Santorum, a day after his stunning sweep of nominating contests in three states, scrambled in Texas on Wednesday to round up the support and money he needs to take on well-financed and well-organized rival Mitt Romney. After winning in Minnesota, Missouri and Colorado on Tuesday, Santorum sought to build on his momentum, addressing Texas pastors, donors and activists with the loosely organized conservative Tea Party movement."Nobody ever thinks I can win anything," Santorum told about 600 people at a meeting with Christian pastors at the Bella Donna Chapel in McKinney, Texas. "The gift of...