Here's an updated look at where the delegate math now stands as of Sunday afternoon. I used NBC's numbers for current delegate totals as they seem to be the most up-to-date and include Guam. Otherwise, the projections here are the same conservatives ones that I used early yesterday.

The number circled in red is really the most important number. Give or take a few delegates, that's the number of superdelegate endorsements Barack Obama will need to hit 2,024 total delegates. And once he's got 2,024 delegates lined up, he'll become the Democratic Party's presumptive nominee.

Also worth noting, these numbers do not include superdelegates like Rep. James Clyburn who have made it pretty clear they will support Obama, but have not formally endorsed. Likewise, it doesn't include one of Guam's recently elected superdelegates, who is likely to vote for Obama pending a recount.

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As I've written before, I think superdelegates would be foolish to wait until after voting is done to declare who they support. In fact, it would be even better if they joined the "Pelosi club," meaning that they would support the pledged delegate winner.

By doing joining the Pelosi club, superdelegates would make it clear that it is the voters who will choose the Democratic nominee -- not political insiders. And if enough of them joined the club by May 20th, then the voters of Oregon could put Barack Obama over the the top, hitting 2,024 on the same day that he also secures the pledged delegate majority. (I haven't updated my estimate on how many supers would be needed for that, but excluding the add-on projections it would likely be in the eighties.)

There could be no better way for Barack Obama to secure the nomination than by the vote of the people, and short of an Obama sweep on Tuesday, there is no better day left on the primary calendar for doing so than on May 20.