Are bloggers making things difficult for Democrats?

The WaPo observes the way bloggers who are trying to help the Democrats are posing a problem for them:

Democrats are getting an early glimpse of an intraparty rift that could complicate efforts to win back the White House: fiery liberals raising their voices on Web sites and in interest groups vs. elected officials trying to appeal to a much broader audience.

These activists -- spearheaded by battle-ready bloggers and making their influence felt through relentless e-mail campaigns -- have denounced what they regard as a flaccid Democratic response to the Supreme Court fight, President Bush's upcoming State of the Union address and the Iraq war. In every case, they have portrayed party leaders as gutless sellouts.

But it's the same old story, as the article acknowledges. The most activist members of a party want something stronger than what ordinary people like. How have bloggers made this any worse? One of the examples in the story is the demand for a filibuster of the Alito nomination, which was made on DailyKos -- but it was made by John Kerry, who, for whatever reason, decided it was a good idea to be writing there. Whether that counts as bloggers putting on the pressure, I don't know. Kerry could have found a forum in any number of places. And the fact is, the NYT was calling for a filibuster too.