At the risk of losing the argument before it begins, let me ask you two questions. Number One: What do Adolph Hitler, Mao Tse-tung, serial killer and eater Jeffrey Dahmer, and Barack Obama all have in common? No, really. Think about it.
Answer: they all believe in gravity. They all hold (or held) the view that what goes up must come down.
Number Two: Do you, in the company of these men, also believe in gravity? No, really.
The two fallacies are blatant. Just because a man unworthy of emulation holds a truth is no reason for you not to believe that truth. All truths should be believed regardless who believes or disbelieves them. And to put Mr Obama in list implies he is just like the other vile men—although, to be fair, Mr Obama’s views on state control are said to be “evolving.”
The two fallacies would still be present if “gravity” were swapped with “bigfoot” or “equality.” A bad person holding a falsity is not an additional reason to disbelieve the falsity, though it is a good argument to further dislike the bad person. All falsities should be disbelieved regardless who disbelieves or believes in them. Plus, in Mr Obama’s defense, many good people believe wrong things; cf. atheism or diversity.
Another point, which flows from these: it is rational for you to distrust anybody who advances fallacious arguments of this (or any) type.
These logical facts being obvious, it is a mystery why Heartland Institute would choose to run the billboard [that it did].