As Rick Santorum prepared to address supporters in Milwaukee last weekend, his Wisconsin campaign team was setting up camp at their new state headquarters in Brookfield.“This area of the state is an important area for volunteers in the Republican nomination,” said Benjamin Hack, deputy director for Santorum’s Wisconsin campaign. In the back of an office building at 405 N. Calhoun Dr. adorned with several Santorum yard signs, the campaign’s headquarters is spacious and so far sparse, with boxes, telephones and chairs waiting on the floor. The back area is “off limits,” Hack said, but the front area has three...