I think you’re right that for someone to change their vote on what a candidate might do or not do in his campaign is indeed a shallow voter.........but there are many shallow voters to begin with I think.... They sway easily....
I’m so glad I determined who I would support, ... compared their histories and positions long before “the show” began. The gimmicks and stunts they all play get really silly in some cases and down right nasty in others.....with everything else in between.
So this ‘stuff’ doesn’t do anything to sway those who have done their homework and are secure with their choice. It just occupies the media and entertains the voters.
The campaigns also get caught up in it, not just the media. And you are so correct about how little a something will sway someone’s vote.