  We study the formation of public opinion in a poll process where the current
score is open to public. The voters are assumed to vote probabilistically for
or against their own preference considering the group opinion collected up to
then in the score. The poll-score probability is found to follow the beta
distribution in the large polls limit. We demonstrate that various poll results
even contradictory to the population preference are possible with non-zero
probability density and that such deviations are readily triggered by initial
bias. It is mentioned that our poll model can be understood in the Bayesian
viewpoint.
