New article out showing how Talk Radio specifically is split in choosing between Trump or Cruz.
To me that's indicative of the problem with talk radio, in that they feel THEY have to choose.
This emphasis on taking sides means you're going to piss off a percentage of your audience. That was easier when the choice was liberals vs. conservatives. This split among conservatives puts radio in the crosshairs, which is not where they want to be. It's safer letting the audience talk about it, and leaving the hosts to moderate. That's more work and less attractive to hosts with big egos.