AM broadcasts actually has a political angle to it:
There are a couple of reasons that AM is in decline, and it's not necessarily political:
Vehicle manufacturers don't want to support AM broadcast radio because it requires making vehicles that don't spew RFI on the AM broadcast bands. That's costly, and they are more interested in saving money. If we want to look at specific manufacturers that have cut AM radio from their vehicles, you can look straight at Tesla. And while we're looking at Tesla, glance over at Elon Musk, and where his political lean is.
Running an AM broadcast station is expensive. A lot of costs involved in keeping a big transmitter hooked up to inefficient antennas and trying to cover a big enough area to bring in money from ad sales. Younger people don't want to listen to poor audio/static, or inane talk shows, so again, no profit from ad sales. There's only so many "Shady Hills rest home" or "Rolling Thunder brand laxatives" ads that can fund a poorly performing AM station. Companies like Clear Channel and I♥Media don't want to support stations that are not pulling in profit. No profit means no share holder dividends. After all, it's all about profit.
People that walk around with phones that play CD quality audio are not really interested in listening to music on AM. Those of us that do are by far in the minority. Many of the AM stations that run politics based talk shows are all airing networked programming, so pretty damn easy to just tune over a hundred kilohertz and hear the same programming coming from another town. Too much saturation with the exact same programming. At least when Art Bell did it, it was entertaining.
As much as I love AM radio and AM DX, technology has moved on. AM broadcast radio is 100 years old and very little has changed since then. FM sounds better, its cheaper and much more popular. Satellite radio is pretty much available in any new car built in the last 10 years, sounds way better and a much bigger selection.
I'd hate to see AM radio go away, but there's some realities here that are not in its favor.
Typed as I sit here listening to an AM broadcast station from nearly a 1000 miles away….