Obama should target Republican districts with the consequences of the sequester

That’s both incorrect and irrelevant to what I said. Let’s address the second point first, its irrelevancy. Say you were correct (which you are not), and that the reason we have many GOP candidates winning 60/40 while Democrats accumulate in 90/10 districts. If that was “true in a majority of the country and divided into districts exactly ho Republicans want”, does that still justify punishing the 40% of the people in those districts who reliably vote Democrat just because they haven’t moved? Is it reasonable to expect life long Democrats to either move or face targeted partisan spending cuts focused on their district for no reason other than they are outnumbered by a 20% margin by neighbors who vote Republican?

For that matter of course it isn’t justified to cut even in 100% Republican districts.

Now on to the other point, I’ve demonstrated at least several times that if you have a certain political ideology whose supporters tend to accumulate in concentrated urban areas, you can very easily " naturally" come to situations in which they “gerrymander themselves.” Now, I’m not saying that in states like Ohio, Pennsylvania, and famously Texas there is not more direct, intentional gerrymandering. But that isn’t “every state” in the country, and many of the smaller states that are red the gerrymander opportunities are limited because of there only being 1-3 House districts in those states. So you’re really only talking about some of the larger States that sent red Congressional delegations that were gerrymandered intentionally, and even some of those it’s not always so clear cut.

The way I explained this last time so that people could understand it (even through partisan blinders, which most Dopers do not ever take off), is: