Things are moving way to fast on the numbers for me to keep up with them -- thankfully the good folks at DemConWatch have developed a widget so that I don't have to.
As I write this post, Barack needs a total of 39.5 more delegates. Tomorrow he will get a minimum of 16 out of SD and MT. That means he'll need just 23.5 more to hit the magic number. (You can up the number by 1 if you want to take into account Donna Edwards' upcoming election to the House.)
So how does Barack get those remaining 23.5 delegates? Per Chuck Todd's report, the biggest chunk will come from the 18 House members who will endorse Obama tomorrow, leaving him needing just 5.5 delegates.
He'll close that final gap from the undeclared pool, which includes 12.5 undeclared Edwards delegates, DNC members, and other superdelegates like Christine Pelosi and Donna Brazile. (Senators and party leaders have indicated they'll stand on the sidelines, which is fine by me so long as Barack gets the number he needs.)

© Jed Lewison