what is your take [opinion] on the progressive Corporate 'Personhood' argument
What aspect of the argument? I have plenty of thoughts on the general notion, but give me a bit better idea what you're asking me about and I'll (hopefully) be able to give you a more focused and thus responsive answer.
EDIT: I guess I can throw out a few general thoughts even without more focus guidance from you.
One thing I'd point out is that people too often gloss over (or rhetorically ignore) this simple reality of existence: Things can be quite alike in certain ways even while they're quite different in others. Indeed, that's the nature of the Universe. Everything is like everything else in certain ways and different than everything else in other ways. Trees are like flowers, except to the extent they're not. The same with rocks and flowers. When you're considering whether various things are alike for certain purposes or in certain ways, the point that they aren't alike in other ways doesn't necessarily meaningfully inform the consideration. I don't need to demonstrate that corporations and individual people are the same in ways X, Y, and Z to persuasively argue that it makes sense to treat them much the same when it comes to purpose A.
Another point is this, assuming part of what you're getting at is people's consternation that corporations are generally regarded as having rights and being protected by various constitutional provisions: I don't think people that argue that they shouldn't be so regarded follow the thought process through enough. They don't apply common sense, they don't consider what it would mean - for practical purposes, in real world terms - if we took the general position that corporations (or human activity that occurs through corporations or under the shell of incorporation that we've conceived) don't enjoy many of the same rights that individual people do. That position would be very problematic, for actual people not just for corporations. It would be actual people whose rights were left unprotected. Government could do what it wanted to newspapers, TV stations, churches - it could trample on the most basic rights that we've come to assume we enjoy. If you want examples I'll provide them - they're essentially countless, and many would be quite unacceptable to most people if they actually considered them.
Lastly, I'd say that the argument that I think you're referring to - the notion that corporations shouldn't enjoy many of the same protections that people do - relies in large part on an intellectual inconsistency. Beyond the practical aspect of the consideration that I alluded to in the previous paragraph, the position doesn't make logical sense if you break it down and think about the argument that's actually being advanced. I don't think most of the people taking that position do that, so they don't realize that in order for their position to make sense they have to argumentatively conceive of the corporate structure as very different things, while at the same time conceiving of it as neither of those things, in order to simultaneously sidestep the arguments that would doom their position logically. On the one hand they have to deny that the corporate form is one thing or their argument falls apart, and on the other hand they have to deny that the corporate form means another thing or else their argument falls apart for different reasons. But the thing is, the corporate form has to be one of those two things or some combination of them, there aren't any other possibilities. When we acknowledge that simple - and I believe irrefutable - reality, we're left with the understanding that it isn't really corporations that have the rights in question it is people acting through corporations that are just retaining the rights in question.
To go a little further with that final thought: One way to conceive of a corporation is as a group of people acting collectively. If someone doesn't want to conceive of it that way, fine - I won't quibble with them. But if it is people acting collectively, it's already apparent that it is actually those people's rights that are at stake and not the corporations. People generally retain their rights even when they act collectively because, for one thing, we enjoy a freedom of association. But what if we don't accept that conception of what a corporation is? if a corporation isn't people acting collectively then what is it? Well, it's something that isn't people, and that set of existence could be divided up into two subsets: (1) Things that exist without regard to human action and act other than by human control and (2) Things that exist by human action or act by human control. In other words, if a corporation isn't the people themselves then it is either something people create or use, or it is something that exists naturally and without human creation and isn't used by humans for their own ends. I'd hope we can all agree it isn't the latter. Corporations are things we create, and they have no interests except those that we impart to them, and they don't do anything except by human direction. A corporation doesn't do a single thing except by human action and in furtherance of human interest (intentionally or otherwise, prudently or otherwise, sensibly or otherwise). It is something we use. So, again, it's apparent that it is actual people's rights that are at issue. We might use a corporation to do something, but it is we who are doing it - it is we who want it to be done, who seek to benefit by it. We use paper and ink to convey information and thoughts, but it isn't the ink or paper's rights that are at issue, it is ours. We use things to achieve our ends, but it is us - people - who are the doers. It is us - people - who have rights that we shouldn't necessarily lose just because we have to use things to exercise them.
Summing up that little mental exploration: Corporations are either the people involved with them or they are something those people use. Or, and this is probably more fairly considered to be the case, they are some combination of those things. Either way, it is the people involved whose rights are in play - not the corporations. If we argue that corporations shouldn't enjoy certain rights what we are really arguing is that people should lose those certain rights either when they (1) come together to act or (2) use something to act. Now, if we want to make such an argument, fine - if we want to condition rights protections on whether people are acting collectively or on whether they use something other than themselves in acting, fine. But let's be intellectually honest about the position we're advancing. This isn't about not extending people's rights to cover corporations, this is about taking away people's rights because they act within the corporate context. There are some plausible, even reasonable, arguments for doing the latter in certain contexts. But in other contexts, those arguments fall flat.