Walz started the trend and it resonated with and energized the base so much to the point where he surged to the spotlight from relative obscurity in a very short amount of time and ended up getting picked as running mate by the Harris campaign.

But then Harris's campaign almost immediately pivoted to the classic strategy of, "damn our base, they're going to vote for us anyway so instead let's appeal hard to the right", despite that consistently being a losing strategy over the last decade or so.

So they told Walz to shut up, just stand there and look pretty and cut it out with the "weird" stuff, it'll alienate voters on the right. Turns out instead they just killed all the momentum growing within their own base while at the same time failing to win the votes of the weirdo cult members wearing ear pads in solidarity with their God king.