The news organizations are still allocating the delegates from Super Tuesday and the weekend contests, and it's definitely a tight race. Here are the current tallies, including super-delegates unless otherwise noted:

CNN: Clinton 1,148, Obama 1,121

ABC: Clinton 1,149, Obama 1,127

NBC: Obama 958, Clinton 904 (Not counting super-delegates.)

CBS: Obama 1,139, Clinton 1,132

AP: Clinton 1,147, Obama 1,142

Bear in mind that these tallies differ for a few reasons, the major one being that each org is still working to apportion delegates at the Congressional district level. The bottom-line consensus is that Obama has a decent lead among elected delegates, while Hillary is able to narrowly edge him out thanks to her lead of roughly 90 super-delegates.

A big thing to look out for, though: If Barack Obama gets a strong winning margin for tonight's Potomac Primary, with its 168 delegates at stake, he will overtake Hillary in all delegate counts, including the super-delegates.