A theory of voter decision-making is outlined. Voters are viewed as rational decision-makers. This theory of ''low-information rationality'' or ''gut reasoning'' is derived from the Columbia University voting studies done in the 1940s, the economic theories of Anthony Downs, and cognitive psychology. Low-information rationality involves the use of information shortcuts and rules of thumb. Information that people need in their everyday lives is also the information that voters can and do apply to their political judgements and choices.