It is. What's more, such support is roughly the same across both parties, but both parties vastly overestimate the other side's support.
How's this different than say...
>polls show 99% (or whatever) of people are against crime
>voters elect a soft-on-crime politician, crime goes up
>"I consider the fact that the soft-on-crime politicians got elected to have falsified all research that people are against crime"
The difference between the two parties is that one elected a leader that agrees with that minority. This 2012 scene from The Newsroom outlines the difference:
* https://www.youtube.com/watch?v=cGsLhyNJBh8
The GOP let (?) the inmates run the asylum.