...New polling shows a significant increase in the number of Americans who describe themselves as liberal and the number of Americans taking liberal positions on issues. Gallup has found the percentage of Americans calling themselves social liberals has equaled the percentage of social conservatives for the first time since pollsters began asking the question in 1999 (when 39 percent identified as conservative and 21 percent as liberal). Democrats are more likely to call themselves liberal and Republicans are less likely to embrace the “conservative” description, opting instead for moderate. ...DanaMilbank,WaPo