The medium is the message.....

There are endemic cultural differences between the Republican and Democratic structures which have pushed them towards success and failure in their secondary media efforts.

The Republicans have been successful on talk radio because their demographics are far more singular, and thus their cultural structure is more befitting a top down distribution of message.

The Dems have generally been more successful on the internet because they consist of a more chaotic cloud of interests and causes who are all seeking a voice.

Efforts to cross these media lines face structural impediments.

For the Republicans to successfully launch an internet effort, they will need to develop a different model than the Obama and blogger realm of "bottom up" chaos, as they seem less comfortable with an open and shifting "multiple voices" model.

For the Dems to succeed in hosted shows they would have to find a large enough audience willing to accept a single top down message.

(Yes, I know about Olberman and Maddow, but let's wait to see how they do once they lose the unifying anti-Bush theme.)

This post drastically oversimplifies, but I think you get my point. The success in different media comes from the differing cultures of the audiences. Efforts to bridge those media divides are not as simple as developing an infrastructure.