When I pointed out yesterday that a consistent reader of the WaPo editorial page would know more about immigration than a reader of its WSJ counterpart, I meant the columns and op-eds — the Post’s editorials are almost as comically bad as the Journal’s on this topic (at least they have been since Meg Greenfield died). A shining example of this is today’s editorial insisting that the immigration service help the Census Bureau count all the illegal aliens in 2010. Note this sentence: “The information obtained from the census is also critical in determining political representation and the allocation of funds.” In other words, congressional and state legislative districts are based on the total population count, including illegal aliens, and if some of them are missed, then the illegals won’t have representation in Congress. We looked at the impact of counting illegals in the 2000 Census, and concluded that their presence caused Indiana, Michigan, and Mississippi to each lose one seat in the House, while Montana failed to gain a seat it otherwise would have.