In the blogosphere, you have almost a reverse dynamic to that found in the media. Overwhelmingly liberal bloggers identify themselves directly as Democrats. Yes, there are many who see the party as the lesser of two evils, and in their hearts would prefer Dennis Kucinich or Ralph Nader, but overwhelmingly I've found bloggers on the left have no problem saying "yep, I'm a Democrat" (I obviously count myself among that group).
But among bloggers on the right, it always seems that great pains are taken to make it clear that they are "independents" or "libertarians" - these are people who usually endorse much of the GOP agenda and reliably vote for Republicans - and they don't identify as "Republican". Yes, there are some like GOPBloggers who identify with the party, but that was essentially a recent development.
Shorter version: The left consists of people who tend to be lock-step ideologues interested in "winning" the war of politics. This is evidenced by the homosexual witch-hunts being conducted by many on the left.
The right consists of people who tend to be free-thinkers more interested in solving problems and winning issues than seeing any political party in particular winning, though that's a hard stance to take without any strong alternatives to the Democrats or the Republicans.
Of course, these are generalizations, but I think hold true in the majority of instances.