Do this as an experiment:
Turn on your AM radio and find one or two of your local Christian radio stations. Listen for a while to the preachers there.
Because they are on the radio, they have your loyal attention. They are great at rhetoric. Rhetoric is defined in various ways – from the positive ("using language effectively to please or persuade") to the negative ("grandiosity: high-flown style; excessive use of verbal ornamentation") (Debating which radio preachers match more closely to the latter definition than the former is a discussion for another day!). Regardless of who you're listening to, most radio preachers have a weight to their words, an underlying authority. They claim to proclaim the only truth you need. They speak in a monologue seeking to convince you of how to think, how to live, and what to believe.
Once you’ve done that for a while, hit the "seek" button on your radio until you get to one of the many politically conservative radio stations in your community. As you listen to Glenn Beck, Sean Hannity, or Rush Limbaugh, reflect on this: How is their rhetorical style similar to the preachers on the Christian radio stations?
They have the loyal attention of their followers. They are great at rhetoric, using grandiose language to effectively please and persuade their audience. They claim to proclaim the only truth you need. They speak in a monologue seeking to convince you of how to think, how to live, and what to believe.
They have successfully emulated the rhetorical style of the radio pulpit.
No wonder so many Christians are so enamored with these guys.