Census counts lead to policy changes and have political ramifications. Republicans would rather under count and democrats, over count.
Time: Why does it matter who oversees the census? In very general terms, Republicans would prefer to err on the side of under-counting and Democrats would prefer to err on the side of over-counting. The options can yield very different numbers for demographic groups and localities — and they have significant political and policy implications. This most recent skirmish is more manufactured than real, the result of willful misunderstandings. But it has its roots in an ongoing battle over whom the census counts — and how.
What's at stake:
The battle over how to count people only makes sense when you look at what is at stake. The redistricting of local districts and reapportionment of congressional seats is based on census counts — a state could gain or lose seats based on its population, and shifts within a state determine plans for redrawing political boundaries. The redistricting that took place in Texas at Tom DeLay's urging following the 2000 census — which swung six congressional seats to the GOP — is just one example of how dramatically political fortunes can shift based on the use of those crucial numbers.
Census counts are also used to determine how many federal dollars may flow to a city or state based on grants and other outlays. Democrats have long charged that the undercounting of minorities and poor Americans prevents federal funding from reaching strapped communities. Meanwhile, Republicans argue that Democrats seek to boost numbers in order to create extra congressional districts in urban areas and to bring in more federal money for their constituencies. They charge that sampling — which Democrats support because it provides estimates for communities that can be hard to track accurately — is unconstitutional because the Constitution calls for an "actual enumeration" of the population.