Argument from Exaggerated Authority
The question that was asked, whether there is an appropriate term to describe an "ad hominem" argument that elevates, rather than denigrates a person holding a particular view, is very valid and timely. In an age when "tribal epistemology" is playing an increasingly dominant role in public discourse, it's important to have an answer. Every tribal conflict involves "two sides" (assuming, that is, that the fallacy of "false dichotomy" is also at play, which is pretty much where we are in American politics in 2019). This means that one side will tend to think their own beliefs to be valid merely because they are the ones who hold them, and will simultaneously believe the "other side's" beliefs to be entirely wrong because they (the "others") are the ones who hold them. This is the "starting block" for the race to the depths of the Post-Truth Era, where facts really don't matter. Tribal affiliation is the only thing that's important. (Star-bellied Sneetches: "There was no quid pro quo" The Plain-bellied Sneetches: WTF??!!)
With each "side" elevating the justification for their own beliefs while denigrating the "other side", do we really want the same term "ad hominem" to apply in both cases? Even if this is technically correct, this is a situation where I feel philosophy needs to "get real", and not devolve into arcane disagreements over nuanced points.
As noted in previous answers, the term ad hominem, is used essentially without exception in cases where the validity of the opposing argument is impugned by attacking the person making an argument, rather than by refuting the evidence on which it is based. It's even gotten to the point that "ad hominem" is commonly (even if inappropriately) used as a fancy-sounding synonym for "insult", rather than as description of a logical fallacy used in an bogus argument. IMHO, the horse has left the barn on this question, and I don't see much point in trying to resurrect some broader meaning for ad hominem that includes both positive and negative cases.
Previous Answers in this discussion claiming that the term ad hominem can be applied in situations where an argument is being supported, rather than refuted, will cause unnecessary and unhelpful confusion. We need solutions... as the problem of "ad hominem" reasoning (s.l.) is an existential threat to the well-being of our society. The highest priority, from my perspective, is to avoid undermining the basic concept that the validity of an argument ought to be based on the actual evidence, rather than on who says it.
But this still leaves us with a need for an expression to describe the "positive case" situation. I don't think there's an obvious word or phrase that will fit the bill in all circumstances, but would suggest that "argument from exaggerated authority" might serve. The fallacy of "argument from authority" is already widely known, even if it is often misapplied with regard to whether the authority is actually warranted or not. The phrase "exaggerated authority", implies that the the warrant for authority ought to be proportional to one's actual qualifications, and could easily be overestimated (or "mis-overestimated", as Geo. W. Bush might say).
This usage would address another frequently recurring meme in American society that is indirectly related to politics... that of "anti-intellectualism". In actual practice, anti-intellectualism is pretty much the domain of the political right wing, but not exclusively so. In the anti-intellectualist view, certain groups such as liberal academics and the "coastal" intellectual elites are agents of useless incorrect beliefs about the world, whereas graduates of the "school of hard knocks"... You know?... Joe Sixpack and his friends? are repositories of practical and reliable street knowledge. Kitchen table wisdom. Those who are sympathetic to this view will have an elevated, or "exaggerated", assessment of the validity of their own beliefs, while simultaneously having an "ad hominem" contempt for the beliefs of the "other side".
So... That's my suggestion: "Argument from Exaggerated Authority".
That'll be 5 cents, please.