I don’t concern myself over that anymore. Approx. 27% of any electorate is like this, unfortunately, and it’s guaranteed that at least one conservative party will give them all the attention they need without a liberal or progressive party having to betray its principles and waste resources better applied elsewhere to avoid hurting their feelings. That’s even more true in a non-parliamentary duopoly situation like the U.S.
That’s not to say that liberal and progressive parties should not govern on the Know-Nothings’ behalf once they’re in power. They just shouldn’t pander to them when they’re trying to get into power. Triangulation worked for a while when things were good, but we’re living in a very different country than we were in the 1990s.