The Cato 2017 Free Speech and Tolerance Survey, a new national poll of 2,300 U.S. adults, finds that 71% Americans believe that political correctness has silenced important discussions our society needs to have. The consequences are personal—58% of Americans believe the political climate prevents them from sharing their own political beliefs.

Democrats are unique, however, in that a slim majority (53%) do not feel the need to self-censor. Conversely, strong majorities of Republicans (73%) and independents (58%) say they keep some political beliefs to themselves.
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self-censorship

https://www.cato.org/blog/poll-71-americans-say-political-correctness-has-silenced-discussions-society-needs-have-58-have