In most sociophysical simulations on public opinion, only two opinions are allowed: Pro and Contra. However, in all political elections many people do not vote. Here we analyse models of dynamics of public opinion, taking into account Indifferent voters. In particular, we consider the process where Contra are forced to be Indifferent by their Pro neighbors in a random network. The final concentration of Contra is found to decrease exponentially with the initial concentration of Pro. The obtained plot is the same for small-world networks of different topology.

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