Low voter turnout is a problem because then the elected officials were elected only by a small sampling of a society. The lower the voter turnout, the fewer the people who have cast their votes.
Most states, counties and municipalities in the United States are comprised of people from all walks of life, such as factory workers, bank tellers, medical professionals, construction workers and senior citizens. If only a few of these people vote, the outcome of the election may represent the wishes of the few who voted instead of the overall consensus of that community. A nation that is democratic in nature needs the input of each of its constituents to be able to govern the overall populace effectively.
If only poor people are voting, then most likely only the officials with a focus on helping poor people are elected. This does not benefit society as a whole. Democracy does not serve the general public if the general public does not participate on Election Day. A low voter turnout may be a sign of contentment or discontentment by the absent voter. Either scenario is difficult to confirm. Without voter feedback, democracy loses its guiding force: the opinion of the voter.