From PoliticusUSA

However, where the gaps have started to widen more
is when we look at political affiliation and religion. In 2009, 64% of
Democrats believed in evolution while a majority, 54%, of Republicans also
believed in the theory. Fast forward to today and 67% of Democrats believe in
the theory of evolution while only 43% of Republicans feel that humans evolved
from lower life forms. That is a remarkable 24-point gap between the two
political parties. Independents saw virtually no change, as 67% believed in
2009 and 65% believe now.