Many people today are disenchanted with the democratic process and stay home on Election Day. They believe that their vote makes no difference and they can't possibly have an impact on the electoral process. But, one vote makes a difference...
100 people are eligible to vote. If ALL register AND vote, then 51 votes decide the election. If only 60 people register to vote (even though 100 people are eligible) AND ALL 60 vote, 31 votes win the election.
If 60 people register to vote, but only 30 of them (50%) vote... then it takes only 16 votes to win the election.
This is essentially what happened in the 1994 Congressional elections. Many local elections were close. Because many people did not vote, a small group of active voters controlled the outcome.
When you choose NOT to vote, you give more clout to every vote that is recorded.