Delays at the U.S. Census Bureau threaten to upend Colorado’s redistricting process, leaving state and federal candidates guessing whether they will live in the district they seek to represent and prospective candidates in the dark as they weigh moves that could make or break careers. “You have to prepare for the issues and focus on that district and you’re not going to know where the district is until December?” Republican strategist and former congressional campaign manager Tyler Sandberg said of the dilemma.