In the WPost today:

The public tug of war among Democrats this week over the Supreme Court nomination of Judge John G. Roberts Jr. underscores the conflicting pressures facing Democratic leaders as they try to satisfy a growing cadre of activists anxious to battle President Bush while avoiding the appearance of being captives of their most vocal constituencies.
The debate over what to do about Roberts is the latest in a series of disagreements over the past three years pitting the party’s Washington-based leaders against traditional liberal advocacy groups or the newer world of grass-roots activists stitched together through e-mail and Web logs.