Gerrymandering happens at the state level ... just like some gun laws are done ... Gerrymandering is NEVER done on a national leve. ... so please tell me how this is a national issue?  It may have national implications just as state gun laws do ...  
The article is about a state issue that was taken to the US supreme court thus making it a national issue ... 
Gerrymandering is also done differently in each state and not uniform in how it is done ...