While we can all agree that this doctor is well within his First Amendment rights to do such a thing, he made a pretty bad decision by doing so. After reading that article, I checked with our sales staff about the particular hospitals and private practices we do business with in Mount Dora. While I did see Leesburg Regional Medical Center on our correspondence, I didn't see this particular doctors name. And that's a good thing, because as a laboratory, we would probably have dropped him like a bad habit had he been affiliated with us in the first place. I imagine the companies that do his testing are probably considering this as well, and if not, they are most certainly going to hit him with an inspection within the month. You can bet your bottom dollar on that.
The sad thing is, it has nothing to do with differences of political opinion, and everything to do with his intention of posting that sign at his place of business. He may not refuse treatment, but if he's that brazen to post that sign, he's probably brazen enough to do other things. My concern would be things like sample-switching, or purposely contaminating said samples as to obscure the results of folks who did, in fact, get treatment at his practice, but made it clear they disagreed with his political views. And we are right to be concerned; after all, he wouldn't be held liable - the laboratory would. And any confirmation tests would be coming out of the laboratory's pocket.
What he did was the business equivalent of shooting himself in the foot, whether you support him or not. It doesn't matter whether you are conservative or liberal, it's probably best to keep your political opinion to yourself at a place of business. A little professionalism goes a long way.