It's not about shaking resolve. Why do his followers support him? It's easy to say because they're stupid, or because they don't see through his bullshit or whatever. It's because they have a need, something missing in the political landscape, something they think he represents and can deliver. If you ignore how he does this and why they feel the way they do and just dismiss them as racist or stupid or whatever you're destined to fail, you're missing a very powerful social and political undercurrent.

You see the popularity of RFK within the Democrat party, it's a similar thing. Everyone's missing something, that something is candor, honesty, good faith work on behalf of the people. It doesn't matter if the person is actually acting in good faith or not, if they're able to present themselves as doing so by signalling that they're not slimy opportunists who will promise anything for power, people will support them.