Using data from four of the Political Values and Core Attitudes surveys conducted by the Pew Research Center over the past two decades, we confirmed their research. Across four Pew surveys, from 1987 to 2009, ideological conservatives outnumbered liberals by a ratio of 3.5 to 1, but liberal supporters of specific programs outnumbered conservative opponents by a 2.2 to 1 margin.

In every Pew survey, there were always more conservatives than liberals regarding the overall role of government and a greater number of liberals than conservatives in support of programs designed to promote equality and economic well-being. In effect, the United States is neither a center-right nor a center-left nation; it is, and always has been, both at the same time.

Not surprisingly, voters who identify as Republicans have tended toward the conservative side of these two tendencies. And Democratic identifiers have leaned toward the liberal side. Although the gap between the identifiers of the two parties has widened recently, during most of the time since Free and Cantril first published their findings, the greatest number of both Democratic and Republican identifiers, as well as independents, has been ideologically conservative and programmatically liberal.