What we need to do is convince the fence sitters is that nothing Trump says can be trusted, that he lies like a rug. Immunize them against the self-promoting bluster which is never completely truthful. They need to change their attitude about claims from the Trump camp, that the first thing to do is disbelieve the claim as bullshit. Most of all, get them to read, not watch the liars, who are very convincing on TV. Convince them that Trump only thinks of himself and has never done anything for anybody else (ask for an example).