It's the redistricting, stupid

I always did like calculus...from "Nate Silver's Political Calculus" column at the NYT:

In the chart below, I’ve detailed the population shifts in different regions of New York State, as well as the attendant changes in the number of congressional districts that they require. Although New York City grew at the same rate, 2.1 percent, as the rest of the state between 2000 and 2010, the number of congressional districts it can support has declined from 12.2 to 11.4 because of the overall reduction in the state’s allotment. The slowest growth in New York City has been in Brooklyn and Queens...

Now I get it. I may be stupid, but I'm slow: 

It is looking more likely that Rep. Anthony Weiner, embroiled in a sexting scandal, could lose his 9th Congressional District as part of a redistricting deal, multiple New York Democratic sources told CNN on Wednesday.

New York will lose two seats when the U.S. House gets reconfigured to reflect population shifts recorded in the 2010 U.S. census. The state's redistricting will be decided by the New York State Assembly in Albany, the capital, with the expected result being an overhaul that would cut a Republican seat upstate and a Democratic seat downstate.

Weiner's district is in Brooklyn and Queens in New York City...

[....] Two of the sources, both Democratic strategists in New York, said that scenario helps explain why New York Democrats haven't rushed to call for Weiner to resign. Many prefer for Weiner to stay, making it more likely his district will get cut and not theirs, according to the two sources.

What, no honor amongst thieves? I'm shocked, shocked...