It is not exactly a secret that science itself supports more left-leaning ideas than right-leaning ideas (depending on what exactly we're talking about and where the Overton window is at a point in time or at a specific place on earth). I think this has less to do with whether left or right is fundamentally right or best. Unfortunately, a lot of what passes as "the right" these days is just... a bit crazy. Of course they had to take a stand for Biden, the only other choice was a lunatic. Love him or hate him, one thing Trump is, objectively, is a bullshitter (in the academic sense of the word). And scientists really just don't like bullshit.
If you get the feeling that Nature is politically biased (and I mean this in the usual everyday person sense, because of course any politics that affects science will be met with strong views), I think that should serve as a signal to check what your biases are.
Remember that the people reading this are all the top experts in their own fields, so you can bet they'd love to write back and argue if some editor wrote something stupid. It simply is the case that the publication is of exceptional quality, and that for the most part, people who read Nature are not people who care about political nonsense.