This paper examines how people often misjudge the distribution of opinions within their group, primarily due to the tendency to equate familiar opinions with prevalent ones, even if only one group member repeatedly expresses them. Six experiments demonstrate this effect, showing that it persists even when individuals are aware that the opinions come from a single speaker. The findings suggest that this bias is driven by the accessibility of repeated opinions, rather than conscious reasoning, and have implications for understanding social consensus estimation and influence.