By the mid-1980s, regularly more than 50% of Republicans called themselves conservatives in General Social Survey data. This peaked with George W. Bush in 2004, who 68% of Republicans called conservative in a pre-election Gallup surveyThis past decade, however, conservatism hasn't been rising. In fact, every General Social Survey poll since 2008 has found that conservatives make up about that share of Republicans. More Democrats (48%) self-identified as liberal in the 2016 General Social Survey than in any other General Social Survey taken since 1974. The rise of liberalism among Democrats has all but wiped out conservative Democrats.

Source: CNN February 23, 2018 00:11 UTC