Comment by chemotaxis

If you're working as an individual contributor, I'm sure it can matter, but usually doesn't. It's widely accepted that people have personal opinions and politics, and that it can even extend to not liking some of the decisions made by the company you're applying to. There are workplaces that might screen for ideological purity, but it's rare. Both because it's illegal and because hiring is hard even without additional self-imposed constraints.

I think the only thing that can derail a job application is if your personal blog makes you look patently unreasonable, either by supporting causes that are socially unacceptable ("it's OK to hit women") or getting way too angry over mundane stuff ("everyone working at Microsoft should be shot"). But if you just happen to have an opinion about a politician, whatever.

Where it gets dicey is if you're in a leadership position, especially director and above. Then, you're sort of paid to keep your opinions to yourself, because when you have an organization of 100 people or more, at least several will disagree with your politics and will then judge your actions through that prism, leading to drama and possible HR fights.