Apparently Nature hasn't endorse a political candidate...ever:
There is no open-and-shut case for preferring one man or the other on the basis of their views on these matters. This is as it should be: for science to be a narrow sectional interest bundled up in a single party would be a terrible thing. Both sides recognize science's inspirational value and ability to help achieve national and global goals. That is common ground to be prized, and a scientific journal's discussion of these matters might be expected to stop right there.
But science is bound by, and committed to, a set of normative values — values that have application to political questions. Placing a disinterested view of the world as it is ahead of our views of how it should be; recognizing that ideas should be tested in as systematic a way as possible; appreciating that there are experts whose views and criticisms need to be taken seriously: these are all attributes of good science that can be usefully applied when making decisions about the world of which science is but a part. Writ larger, the core values of science are those of open debate within a free society that have come down to us from the Enlightenment in many forms, not the least of which is the constitution of the United States.