And for three hours each Saturday morning since June, he has played the cerebral but feisty host of a radio show now syndicated in 35 cities, from Seattle to Boca Raton, Fla., an advocate of the left in a medium dominated by the right.

With a breadth of experience and perspective, older bloggers are staking out a place in the blogosphere - a medium overwhelmingly dominated by the young.

It began in the 1920s when Glen Sample, an American advertising agent, had the idea of adapting a newspaper serial for the radio, a medium already dominated by commercial interests.

But listeners to talk radio - a medium dominated by conservative hosts - split between the two candidates.

However reviewers have called The Variants "a sharply written and produced series" and noted positively the Variants strong LGBT and female characters in a medium dominated by men.

Cheret not only used art as a marketing device; he transformed public advertising from a medium dominated by text and black-and-white images to one filled with vivid colors and a sense of motion.

Business news needs to go beyond the surface facts into the background, history, causes and effects, and that can be difficult in a medium dominated by the visual image.

There is a dearth of women - 10 out of 48 artists - and a dearth of painting, which is typically seen as a medium dominated by Europeans, usually male ones.

In a medium dominated by white conservative voices, Eli provides shows with a controversial black perspective.

But CNN has two strikes against it: the cable network is part of a medium still dominated by broadcasting, and its average daily ratings are still very low in a business enamored of numbers.