The dynamics of the talk format as a whole intrigue me. Take a very blue market like Seattle.
The market has four conservative talkers on AM - now, one is Salem and one iHeart, so set those aside for national clearance reasons and ownership - they don't rate well, and don't need to for what they are. That leaves two local AM talkers - Bonneville's KTTH and Lotus' KVI. Each one performs pretty close to the other in the ratings, and each has two local hosts.
The dominant FM talk signal is Bonneville's KIRO. Their lineup has a morning news magazine, followed by two moderates (one leaning left, one center-right.) Then, a libertarian conservative co hosting with a centrist Democrat. Then, a conservative, followed by another conservative. Even the more balanced station, leans conservative in a solidly blue market.
The facts are, talk radio even in very blue markets is dominated by conservative hosts. And I have never been able to grasp why, for the most part, liberal hosts don't get traction. I know it's not because the talent doesn't exist. There's plenty of liberal entertainers in all media that are very successful. So it's either that these talents aren't being developed, or liberal leaning individuals simply don't like the format of commercial talk radio as it exists in current times. Either way, the "liberal media" cliche certainly doesn't apply to the talk format in the United States.