Former President Barack Obama isn’t the only past Democratic leader who refuses to ride off into the sunset. Hillary Clinton reemerges Tuesday with a new book explaining yet again her loss in the 2016 presidential election — without much insight into how they can win next time.

Some Democrats worry that the continued prominence of both Obama and Clinton will overshadow a new generation of their party’s leaders and rising stars. Both have already contributed to the thinning of the Democratic bench: Obama presided over massive down-ballot losses while Clinton’s defeat last November left Republicans with unified control of the federal government.