My point is there is a fundamental difference between writing to your audience, ala NPR and pontificating, ala Rush.
NPR has a liberal audience, and their programming reflects that. It is designed to appeal to the people that are contributing - college professorial types.
Rush is part of the machine. He sells the politics as his entire act. It is not 'conservative-friendly programming'. It's not Happy Days or Leave It To Beaver. It's an active sermon. NPR news (Morning Edition for example), does not do that. It's a false equivalency.
At the very least, it's a soft sell vs a hard sell.