According to a Newsweek poll done in march of 2007:
Only 13% of Americans believe in naturalistic evolution (that is that God had no part in evolution)
However, 48% of Americans believe that God created "humans pretty much in the present form at one time within the last 10,000 years or so"
30% of Americans took the middle ground responding that they believed "Humans developed over millions of years from less advanced forms of life, but God guided this process"
9% remained unsure.
And it seems that this poll is not a fluke as many other polls from different polling companies have reported very similar findings. Go to polling report and look around at some of the other polls if you'd like.
It seems, to me, that these results are good news for Mike Huckabee who has gotten some heat for saying that he doesn't believe in evolution. Those kinds of attacks seem quite strange in light of America's views on the origin of life on earth.
I mean why would you attack someones view when it lines up with about 78% of Americans?
But all that aside, Im not even sure why you would bring up this question in a presidential campaign as it has nothing to do with what it takes to be president.