"32% described themselves as Democrats, 26% described themselves as Republicans, and 42% described themselves as independents or members of another party".
Yeah, only 26% Republicans. Riiiiigght.
Poll internals can be found here:
http://cdn.cnn.com/cnn/2020/images/01/20/rel1a.-.trump,.impeachment.pdf
Also, the questions asked can weight the answers and the poll. Do you still beat your wife?