Remember your census form? The first results from the national headcount should arrive this week. Those numbers and the data that follow will lay the groundwork for a once-in-a-decade political battle. State lawmakers will examine hundreds of thousands of census blocks next year, all part of redrawing legislative and congressional boundaries to match shifting populations. Drawing a map is the easy part, but since the new districts will affect the balance of political power until 2010, drawing a map that all parties can accept may take years. Minnesota Public Radio's Michael Khoo has this preview of the redistricting process.