How voting intentions evolved: A view from Quebec Citizens and pundits not infrequently complain that there are too many polls during election campaigns. But the large volume of polls has many advantages. First, people do not have to rely on a single source of information on the state of public opinion. When polls give different readings of the situation, we are able to put the numbers into perspective and are reminded that the margin of error in polls is real. Second, researchers and voters can trace the evolution of public opinion throughout the campaign, and get an objective measure to set against politicians’ claims as to the level of support for their parties or policies.Subscribe or Log In to read more.