All this means is they had some super-delegates who were going to vote for Hillary hold off on announcing their intent until now for the media coverage. It's a silly move because the optics are bad to clinch via supers over pledged; but they really must be growing tired of the Sanders campaign and wanting to send a message that she has this wrapped up regardless of tomorrow's events. Whether it's useful or not is to be seen.
What's so good about clinching it tonight versus tomorrow night? If she had told the supers wait until wednesday, she gets the clinch call tomorrow on network special coverage, drawing in millions of viewers for her victory speech. This way, there is no clinch call to make tomorrow since it has already been made. Tomorrow's elections might be played by the media as a 'referendum on the superdelegates' that will be deemed to have failed if CA votes Bernie. It will be clear that the contests are a complete afterthought. Far fewer people will watch Clinton's victory speech. It could dramatically lower pro-Clinton turnout. It gives Sanders's anti-superdelegate rage additional credibility. And it just looks bad to get the last few with supers. Clinton should have been very clear with the renaming supers - you hold off until Wednesday (or late Tuesday night) or I will disavow your endorsement.
I was thinking that the SDs decided to commit tonight so as to depress turnout tomorrow in California and in states where Bernie is expected to do well. A loss for Clinton in CA would still look embarrassing even if she didn't need it. Although it could also backfire with Clinton supporters staying home and pissed off Bernie supporters turning out to say "Fck you" to the superdelegates.
Either way, tomorrow should be very interesting now.
