. . . "Nationwide opinion polling for the United States presidential election of 2012 (SIADD)"@en . "This article is a list of the RCP Average Poll (based on nation-wide public opinion polls) that have been conducted relating to the 2012 United States presidential election, presumed to be between incumbent Republican president John McCain and Democratic challenger Hillary Clinton."@en . "This article is a list of the RCP Average Poll (based on nation-wide public opinion polls) that have been conducted relating to the 2012 United States presidential election, presumed to be between incumbent Republican president John McCain and Democratic challenger Hillary Clinton."@en . .