There have been electors getting loose, like in 1960 when 15 electors bolted and voted for Harry Byrd (Kennedy still won), but I don’t remember electors being cajoled like this. (I’m in my 60s.) It’s a threat to our democracy, as Hillary Clinton said, not to accept the outcome of the election.
Actually, I now recall that the 1960 election involved Harry Byrd being supported by unpledged electors (Alabama and Mississippi). I think only one elector actually bolted and voted for him (Oklahoma). In 1968 an elector in NC voted for Wallace.