90% of AM radio stations are owned by ~5 companies pushing a conservative agenda, with a similar disparity in programming (i.e., 90% conservative).
Most of the 10% of non-conservative stations are in progressive markets, where they have little impact. E.g., in San Francisco, the programming split is ~70/30% conservative/liberal.
Here's the (admittedly biased) source, but the numbers would be easily rebutted if untrue:
https://www.americanprogress.org/article/talk-radio-by-the-n...
AM radio licenses are a fixed government monopoly, and it's well within the budget of political organizations to subsidize a radio station, so there will be no change in this disparity driven by market solutions.
Assuming the numbers are true, once government policy results in an enduring political bias in media, does the government have any responsibility to mitigate that bias?
Does the government have any obligation or even mandate to reach into product design and require certain features - features unrelated to safety, pollution, energy, or any other generally accepted social good?