Already been posted.
But while everyones is running around, foaming at the mouth, you should note that it is not the "content" of the sign that is in violation [of a freely signed covenant]. It is the sign itself. That is not a minor distinction.
Get a grip. The homeowner is trying to changes the agreement after the fact, not the HOA.
Gee, that's nice. It must have been posted with a different title because it sure didn't come up when I searched prior to posting, which, by the way, I always do. If the moderators object to a 'double posting' they will usually pull the thread, particularly if they get enough shrill complaints about it.
And since you seem terribly concerned about duplications, be advised that someone else in this thread has already mentioned it.
Get a grip.
Consider courtesy as an interactive option.
How "freely signed" is it when everyplace has such covenants? All they have to do is change their policy to prohibit negative signs and partisan political signs, and this one would fall into the OK category, while most any sign in opposition would be negative. If the neighbors want to put up a "We Support Osama" sign, well good luck to 'em.