Brief note - TPM reports that today's 3 day tracking indicates a narrowing of the Obama lead to 49-45%.
This four point shift most likely indicates a combination of two better Clinton days Sun and Mon.
If this is anything more than statistical noise, it might indicate that once again Clinton gains whenever it looks like she is being pressured to concede - it may have to do with the reflexive female support for her as the first serious woman candidate, or at least some resentment at the idea of (mostly) men trying to order her to disappear.
In any event, as always, Obama just can't seem to shake her.