Gerrymandering is easier to get away with in more densely-populated areas. -You'll notice that many of the highly irregular districts are clustered around cities and metro areas. When there are more people in a given area, partisans have more leeway in how to draw their districts.
I believe that this article is talking about the density of certain communities and how it makes Gerrymandering easier to divide the people. When I think of Clustered cities and metro areas I honestly think of New York. Partisans are able to see the populated community and are able to draw their districts in a form where one community can be changed into two or three.
I chose this article because Legislatures use Gerrymandering and I believe it has a strong Leadership in a state. Changing the Districts especially to have a certain society here or there is a sense of manipulation. Manipulating the amount of votes in community can make a difference in electoral votes, especially New York. They have control of making the majority group of people exactly what they want. One example i can give might be Washington Heights and how it has been divided to the point where the majority of the people are Hispanics. It actually has me thinking if they can control how we are divided within communities then are they able to control the amount of incoming votes in big and small states.