Quoted: Kenneth Mayer is a professor of political science at UW-Madison. He says losing seats can set up a potentially bruising redistricting battle ? one where an incumbent can be literally written off the map, or where two incumbents can be forced to run against each other in a newly drawn district. While the number of seats here will stay the same, Mayer says political lines will almost certainly have to be redrawn based on population changes within Wisconsin.