Some years ago somebody noted that a lot of politicians recycle their speeches at dozens of events, using the same anecdotes, phrases, etc.
So why not copyright an opponents “catch phrases” out from underneath him, then send him cease and desist orders when he uses them again in public?
It would have to be tailored to avoid fair use, but it could have a huge nuisance factor on the campaign trail.
And apply that rule to News reporters, too. My wife and I have a running bet as which catch word or catch phrase the local news reports will use tonight. I joke to my wife that they must have a big bowl with all of the phrases written on pieces of paper. They reach in and grab one or two while they are writing the story.