Every vote counts.

Source: https://www.washingtonpost.com/local/virginia-politics/voters-assigned-to-wrong-districts-may-have-cost-democrats-in-pivotal-virginia-race/2018/05/13/09a9dd8a-5465-11e8-a551-5b648abe29ef_story.html

«No one has suggested that the mix-ups were anything other than innocent errors.

….

Although ballots are secret and Virginia does not register voters by party, records suggest that 17 of the 26 people who live in the 94th District but were mis­assigned to the 93rd were likely to vote for the Democrat because they had voted since 2008 exclusively in one or more Democratic primaries. Only one of the 26 had voted in Republican primaries, and records for the remaining eight did not show primary participation.»