Prince George’s County Executive Angela Alsobrooks (D) shook up the senior leadership team of her U.S. Senate campaign Tuesday, parting company with a highly touted national Democratic strategist and bringing in high-level operatives with ample experience in Maryland politics. The developments come as recent public and private polls on the May 14 Democratic Senate primary have shown Alsobrooks slightly trailing her principal competitor, free-spending U.S. Rep. David Trone (D-6th).