Episode 5 of the countdown to ending this nomination contest. The "magic number" is the number of delegates that either candidate needs, above those earned and currently projected, to end it.
Given the steady stream of superdelegate announcements, Obama only needs 51 net more delegates, based on additional superdelegate announcements or out-performing expectations in upcoming races, to get to 2024. That's down from 64 last time (due also to more information about likely add-on delegate results, such as the planned 3-2 split in California's add-ons).
Obama continues to need fewer than one in four unpledged superdelegates to go his way; Clinton now needs more than 85% of the unannounced supers to go against the pledged delegate winner.
I had once thought that the race might end after next Tuesday's elections in IN and NC. That appears less likely now, but may be possible. If Obama exceeds expectations and wins both contests, it could result in the superdelegate wave needed to put the race away. More likely, it will continue through the remaining contests, and then the foregone conclusion will be reached, finally.
I've previously posted a version including FL and MI as a "thought experiment." I don't see a reason to keep updating it since the difference would be immaterial, but if you want to see what it looks like, here it is.
Updated: I corrected the numbers slightly. I had forgotten to subtract the Pelosi club from the number of unannounced supers.