HASTY GENERALIZATION (SECUNDUM QUID) *"More than two-thirds of those polled say..."

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An argument in which a proposition is used as a premise without
attention given to some obvious condition that would affect the
proposition's application. This fallacy is also known as the "hasty
generalization." It is a fallacy that takes evidence from several,
possibly unrepresentative, cases to a general rule; generalizing from
few to many.

Note the relation to statistics: Much of statistics concerns
whether or not a sample is representative of a larger population. The
larger the sample size, the better the representation. Note also that
the opposite of a hasty generalization is a sweeping generalization.

*Two thirds of those polled may as well be two of the three people you
asked who just happen to agree with you anyway.