True, but as I said in my edit, it's very hard to get a judgement in a case like this. To once again reference OJ, he was very short on cash after losing a civil suit to his victim's families, but never tried to claim damages against any of the many, many, many high profile people who had openly said he was a murderer before and after his acquittal. I have a few theories as to why that might be:
1. OJ Simpson is incredibly forgiving of personal slights, despite the whole "murdered two people out of jealousy and rage" thing suggesting otherwise.
2. OJ had a clear cut case and wanted to sue, but was unable to find an attorney to actually put a suit together, because lawyers are a famously moral and upstanding lot and would not take an easy case like on account of how crude it is to sue people for calling a murderous spade a spade.
3. It's very hard to sue someone in a circumstance like this, because US libel law heavily favors the alleged libeler.
I will let you be the judge of which one of those scenarios is the most likely.