A Census reapportionment primer

The U.S. Census Bureau is making a big announcement Tuesday, when it announces which states are going to gain and lose seats in the next Congress. (And, yes, we are genuinely excited.)

The congressional reapportionment process, which is done after the census every 10 years, means some pretty significant changes for plenty of states. States that add districts will have to figure out where to put them (a good problem to have) while states that are losing districts may have to match incumbents against each other in the 2012 election (a bad problem to have).

According to the latest Election Data Services estimates, 18 states are projected to gain or lose seats. But that won't be official until Tuesday, and a few states are teetering right on the edge for that final seat.

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