1,627 should be a familiar number to you by now. It's the number of pledged delegates a Democratic presidential candidate needs in order to secure a clear majority of the delegates chosen by Democratic primary and caucus voters.
Once a candidate hits 1,627 pledged delegates, the only way he or she can lose the nomination is if superdelegates decide to overturn the judgment of voters.
Here's where we stand according to MSNBC's estimate: Barack Obama has 1,194 pledged delegates and Hillary Clinton has 1,037.
On Tuesday, there are four primaries -- Ohio, Texas, Rhode Island, and Vermont. In total, 370 delegates will be awarded. As you probably know, the only one of those whose outcome is not in doubt is Vermont, where Obama will certainly win. Clinton is favored in Rhode Island, but it's closer there. Still, the big prizes are Ohio and Texas.
Obama has led many of the recent polls in Texas and is closing the gap in Ohio. Because of the way delegates are distributed in Texas, Obama will probably do no worse there than breaking even. In Ohio, I suspect Clinton will eke out a small victory (mostly because I have a horrible track record at predicting things like that!).
Anyway, all in all, I wouldn't be surprised to see Hillary Clinton end up with 190 of the 370 delegates awarded on Tuesday, compared to 180 for Obama.
If that happens, after Tuesday she'll be at 1,227 pledged delegates and Obama will be at 1,374.
At that point, we'll be more than 80% of the way through the process with just 624 delegates left to be awarded.
To hit the magic number, Clinton will have to win 400 of the 624 delegates -- 64%.
Obama will have to win 253 of the 624 delegates -- 41%.
(The numbers add up to 105% because John Edwards has 26 pledged delegates and it is possible neither Obama nor Clinton would hit 1,627.)
The bottom line is that even if Clinton does about as well as she can expect to, it will still be almost impossible for her to acquire enough pledged delegates to hit the magic number.
There's just virtually no chance she could win anywhere near 64% of the remaining delegates after Ohio and Texas. She'll point to Pennsylvania, which is is a big prize worth 158 delegates, but Obama will counter with Oregon, Mississippi, and North Carolina which combined have 200 delegates and will almost certainly deliver larger delegate margins to him than Pennsylvania ever could to Hillary.
Under an absolute best case scenario for Hillary Clinton, she might scrape by with a net loss of about 4 delegates from those states.
At that point, with just 266 pledged delegates left to be selected, Obama would need win just 72 of them to hit the magic number. Hillary Clinton meanwhile would need 223 of them -- 84%.
Barring an unforeseen epic collapse by Barack Obama on Tuesday, there's just about no chance Hillary Clinton will hit the 1,627 number.
Yet she's still running hard, and attacking even harder.
The question is: why? Her situation is nearly hopeless -- unless she thinks she can pull off a superdelegate engineered victory.
That's a topic I'm planning to address in the coming days, because I'm beginning to think that no matter what happens on Tuesday, Hillary Clinton will push on past Ohio and Texas.
And that could get very ugly.