I see nothing here that'd hold them legally liable.
As though they didn't have their numerous legal reprasentatives read up and find out just how much they could "not" say about something prior to the ad campaign. The other place is just having a whine about it...although, deliberately slandering your competition isn't exactly the most upstanding thing to do IMO...
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It's not the bullet with your name on it you have to worry about...it's all those other ones marked
"to whom it may concern."
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