http://www.addictinginfo.org/2015/06/06/federal-judges-throw-out-virginia-gops-totally-not-racist-redistricting-map-video/
"when you try to shove all the black people who will never vote for you into a single district to lessen their influence — like the GOP did in the state of Virginia — you’ve crossed a line. While there’s some leeway for moving voters around based on which party they vote for, it’s still technically illegal to to corral people into a single district based on their race."