The general idea of natural selection, Darwin's explanation for how evolution happens, is pretty simple: organisms that can't survive in a given environment don't. Moreover, organisms that can't attract mates and reproduce won't propagate, so their genetic make-up will die out after a generation. (Of course, this leaves open the question of why there are still geeks in the human population.)
So from this, you can see that interfering with this natural selection process will affect evolution. If we help weak or unfit individuals survive and reproduce, we alter the outcomes. Yet we do this all the time. That's what health care is all about.
The Republican Party, on the other hand, is opposed to universal health care. They would rather see the 99% eliminated from the gene pool, so the human race can evolve into a species that can afford health insurance.
So the political party that doesn't believe in evolution is actually doing the most to support it.