I feel like some processing is going on. They understand that the speech is signalling loyalty to interest groups, but they don't actually remember the words said and also mistake the loyalty group being signalled (hence the "leopards ate my face" phenomenon, at least partly). This isn't critical analysis, the belief that "politician is saying that for me!" and "politician is saying what we're all thinking!" is the barest bones of processing. They do engage a bit more energy if a politician says something they openly disagree with.