As promised, I've updated the post-Pennsylvania delegate totals and the magic number tracker for ObamaIsWinning.com. The same information is now also available on the sidebar on the home page of The Jed Report.

As you can see, the most important thing that happened on Tuesday night is that Barack Obama reduced the number of pledged delegates he needs to win to hit the magic number down to 133.

In many ways, the campaign is now a one man marathon, with Barack Obama nearing the completion line with each passing primary. To the extent that it's a contest, it is a baseball game in the 9th inning and Barack Obama is ahead by 20 runs.

The problem of course is that the media is incapable of reporting on it this way, partly because superdelegates are dragging their feet. Ultimately, how they portray Barack Obama's victory matters, so what we want to see is a narrative where Obama crosses the finish line in triumph. I wrote about this late Wednesday morning and I'll take another whack it again on Thursday.

1. The Real Magic Number is (still) 1,627

1,627 is fifty percent plus one of the 3,253 democratically selected delegates to the Democratic nominating convention.

Once a candidate has 1,627 of these "pledged" delegates, he or she will win the nomination -- unless the 795 superdelegates overturn the judgment of voters.

And that's not going to happen.

2. Magic Number Tracker

Here's where the race stands after Pennsylvania, using the Obama campaign's numbers. 408 pledged delegates remain to be chosen.

Note that the Clinton and Obama percentages don't total 100% because John Edwards has 18 delegates, so it is theoretically possible that neither candidate will reach 1,627. (In reality, this won't happen, obviously.)

The clock is running out. We have now selected nearly 90% of the pledged delegates that will go to the convention in Denver. In many ways, Barack Obama isn't just winning -- he's already won.

3. The delegate math gives Barack Obama a mortal lock on the nomination

Just look at it from Hillary Clinton's perspective. As you can see from this chart, even if she were to win 58% of the remaining pledged delegates -- a near impossibility -- she would still trail Barack Obama by 100 pledged delegates at the convention and would need nearly three-quarters of all uncommitted superdelegates to support her campaign. There's no way three-quarters of those superdelegates will support a coup against the voters.

The most likely scenario has her trailing by about 150 pledged delegates. She'll need to win over eighty percent of the superdelegates at that point -- an absurdly impossible challenge.

Update: These numbers now reflect the estimated distribution of unnamed add-on superdelegates, which unlike normal superdelegates are tied to election results. These charts use a conservative estimate of 33 Obama add-ons and 32 Clinton add-ons.

(Superdelegate totals from 2008 Democratic Convention Watch.)