Political pundits often suppose that presidential election outcomes reflect the current and future ideological mood of the country. For example, Obama’s election in 2008 was hailed as the advent of “The New Liberal Order” and cited as evidence that “liberal views have re-emerged with a vengeance.” His reelection in 2012 was even more improbably described as “the most decisive mandate for an assertive, progressive governing model in well over a generation.” In reality, Stimson’s data show, the public was already more conservative than usual in 2008, and a good deal more conservative by 2012.
The ups and downs in Stimson’s measure over the past 60 years suggest that partisan turnover in presidential elections is more often a cause of opinion change than a consequence of opinion change. The marked conservative shift under Democrat Barack Obama is by no means unusual; the country also moved sharply to the right under Bill Clinton (before the Republican takeover of Congress in 1994) and Jimmy Carter. Conversely, public opinion moved sharply to the left under Republican presidents Dwight Eisenhower and Ronald Reagan. Indeed, from the standpoint of public opinion, the “Reagan era” had already passed its high water mark by the time its namesake was inaugurated.
As Christopher Wlezien (gated) nicely put it, the public tends to act as a “thermostat,” shifting to the left when the political climate in Washington shifts to the right and to the right when policy shifts to the left.
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