Gerrymandering

"When all the votes are counted, in other words, the result will be either a very narrow GOP majority, a very narrow Democratic majority, or a tied legislature — despite the fact that Democratic candidates outperformed Republicans by about 9.4 percentage points.ThinkProgress calculated this figure using unofficial vote counts published by the Virginia Department of Elections — the final numbers will change slightly as provisional ballots are counted and as some ballots are recounted. You can check our work here."

From Think Progress