Sander's last couple of wins. They are far to focused on the Trump v. Clinton race, and don't seem to want anything to disrupt their storyline.
Besides, once again, unless Sanders wins by 40 or more points, the delegates will more or less evenly split when you take the supers into account. This always seems to be how they finish the 10 second blurb on Sander's wins. "Bernie Sanders won the West Virginia primary yesterday, but only netted 5 delegates, so this does nothing to stop the massive Clinton lead..."