Leadership. Leadership. Leadership.
I think people expected some 10-years-in-the-making master plan from PFAW/NAARAL, which never showed up. The outpouring of support after Kerry made an announcement shows that people were ready to act, but needed someone to lead the charge.
Unfortinately for all of us, Chris, no blogger is in a position to lead any kind of popular political action. Stimulate a groundswell is about as close as we get, but without someone who's got mainstram clout and influence, you don't get critical mass.
It might be easier for blogger(s) to drive press criticism, but the bar for meaningful action there is significantly lower. Just a few hundred comments on the WaPo blog is enough to bring down the house, apparently.
Stoller was right: the progressive leadership simply didn't really want to put in long hours on this.