Those answers hit the spot, but as a former broadcaster familiar with FCC rules, I will add this. At one time there was such a thing as the Fairness Doctrine, or as we called it, the equal time provision. If you allowed a Democrat 30 minutes, the law said you had to allow a Republican 30 minutes. It wasn't just politicians, it was anything public. If you had a white preacher like Pat Robertson on, then you had to allow the black Jesse Jackson equal time (well, still politics, I guess). In the beginning, management was terrified that equal time would wreck the stations financially, After deregulation, these rules no longer applied, but the media tries to police itself (up to a point). They also found that equal time actually works in that these controversial figures do bring in the viewers, as in the other hubbers' answers. Then I think they lost all touch with reality and forgot anything about equal time. I believe that they are now going for the sensation.
Or you might look at it this way. They are still giving equal time. If they allow an intelligent person 30 minutes or an hour, they have to allow a stupid one equal time!