Do you support the blacklisting activities like those discovered going on at Google?
I don't know what Google is doing and you didn't provide a link to something credible that explains what, other than providing Internet searches and other services, Google is, as you say, "doing."
When I was the managing partner of my firm, I didn't use political affiliation (known or apparent) as a discriminant. I some years back sold my firm, and now I'm a senior partner who reports to an executive committee and a managing partner, so enacting such a firm policy isn't any longer my decision to make.
In the specific case of my firm, I'm sure I wouldn't support such a thing. The firm's client list reads much like the Fortune 500, and there is no dearth of conservatives running those companies. It'd be very detrimental to our business were we to implement such a policy and our having done so were to become publicly known.
Consequently, if my firm were to enact such a policy, as long as it doesn't become public knowledge, I might be indifferent about it, because it's not illegal, provided I also didn't observe any sound basis for construing that such a policy reduces firm revenue and isn't harming our ability to attract outstanding candidates for employment and later entry into the partnership. Were it to become known that my firm have such a policy, I would not support it because it would then surely adversely affect firm revenues. Quite simply, the point of the partnership is to make money. Implementing optional policies and procedures that contravene firm efforts to maximize economic profits is antithetical to why we are in business to begin with.