I wouldn't describe it as "pro-Democrat" - that would imply it embraces the Democrat governing agenda. For example, embracing more federal power compared to the Republican ideology of more state power. Which has nothing to do with science.
It's more so caught up in the liberal cultural agenda. Which Democrats align with. A square is a rectangle but a rectangle is not always a square.
I think _both_ conservatives and liberals have turned to postmodernist questioning of science. Just as conservatives question climate change science, liberals question biological sex science.
Both are detriments to society and show how we're not exactly moving forward culturally. But it seems the liberals, who tend to embrace a panpolitical ideology (where everything is political) are actively hurting established science. Thus Scientific American would be a much more useful and enduring resource - especially in the social media age - if it kept to science and didn't cross into politics.