I have the distinct impression that the Democratic Party sees the liberal blogosphere as being inside the tent, while the Republican Party views the conservative blogosphere as being somewhere between an irrelevance and a minor nuisance. Maybe this is true, at least in part, because many prominent "conservative" bloggers (Andrew Sullivan, Glenn Reynolds, Stephen Green, and Eugene Volokh spring to mind) are not exactly stalwart Republican party loyalists but rather libertarians (or whatever) who put routinely put their principles ahead of party interests. Alternatively, maybe the Democrats have just decided to follow Lyndon Johnson's advice about keeping your critics inside the tent peeing out rather than outside the tent peeing in.
I think he's right. There's no doubt that the GOP party apparat is less engaged with the blogosphere, overall, than the Democrats'.