It comes down to the demographics. Younger people watch TV and the Internet. Older people use the radio.

Limbaugh had a TV show for a few years and it was a total ratings bomb.

Limbaugh's show is on in the middle of the day when the older folks are up. The Daily Show and the rest are on late at night when younger people are up.

None of this just 'took place'. Demographics is a science and there is big bucks riding on the information. If Air America had delivered the auds advertisers are after it would still be around.

Of course, it did help to get Senator Al Franken into office.