tl;dr- While a good blog could be a professional asset, the given description sounds like something that probably wouldn't enhance an application.
Blogs can be professional assets, even with political content
A good blog can be a professional asset. Such a blog could even touch on topics that others might consider politically sensitive; for example, it's entirely respectable to write a technical piece on forecasting climate change using data science techniques.
You can even write a heavily political blog in a professional way. FiveThirtyEight's a great example of this: they're heavily involved in political analysis, but they're quite professional about it. I'd imagine that its writers would generally do well to include a reference to it in their future job applications.
Then there's a grey area when it comes to the interfacing with politics in one's own field of expertise. For example, if a climate scientist were to maintain a blog devoted to their research on climate change, then it wouldn't seem like the worst thing in the world if they occasionally included a political perspective piece in which they maintained an objective tone while expressing personal political opinions. However, it'd be important for such opinion pieces to be substantial in terms of content and analysis.
Political rants tend to come off poorly
Political rants can cause the reader to think less of the writer. This can be true even if a reader shares some of the same opinions.
I suspect that a lot of factors go into this. As a partial list, in no particular order:
Readers get into the habit of filtering content from politically charged sources, so if the writer starts to sound like a source of politically charged content, it makes sense to put less trust into their assertions.
Strong political positions can reflect on a lack of political knowledge (Dunning–Kruger effect), professional focus, emotional inclination toward objectivity (stability), or/and reasoning skills.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.
-Bertrand Russell, on BrainyQuote
The willingness to engage in political rhetoric in professional venues (e.g., a job application) negatively reflects on one's general professionalism.
As a consequence of factors like these, many'll tend to respect a writer less for their political rantings even if they would tend to agree with the opinions expressed in those rants.
Overall, probably best to not share this blog
For the reasons given above, sharing a "partisan blog" that has "some strongly worded opinions" would seem like a bad idea. While it's not impossible that a reviewer might actually enjoy it, I'd expect it to generally have a negative impact if anyone takes the time to check it out.
In general, folks'll be more likely to think well of your ability to operate in other venues if you're able to conduct yourself with the same sort of professionalism that you'd approach Physics with, keeping a level and objective perspective throughout.
