Barack Obama's likely delegate take from Mississippi appears to be a +5 edge — while he won the popular vote by 24 points, Hillary Clinton's narrow win in the First Congressional District will apparently keep the delegate margin at 19-14.

But here's something to put it in perspective: Between the Mississippi and Wyoming results alone, Obama will have just about undone Hillary's small delegate gains from March 4.

Here are the latest delegate estimates from various news organization, including super-delegates unless otherwise noted:

CNN: Obama 1,608, Clinton 1,478
CNN: Obama 1,402, Clinton 1,240 (Not counting supers)

NBC: Obama 1,610, Clinton 1,496
NBC: Obama 1,394, Clinton 1,242 (Not counting supers)

ABC: Obama 1,600, Clinton 1,484

CBS: Obama 1,591, Clinton 1,471

WaPo: Obama 1,596, Clinton 1,484
WaPo: Obama 1,385, Clinton 1,237 (Not counting supers)

NYT: Obama 1,510.5, Clinton 1,403
NYT: Obama 1,348, Clinton 1,210.5 (Not counting supers)

AP: Obama 1,596, Clinton 1,484
AP: Obama 1,385, Clinton 1,237 (Not counting supers)

Late Update: Hillary actually won the First District, not the Fourth as originally listed.

Today is the Mississippi primary, in which Barack Obama is excepted to win big thanks to heavy African-American turnout, as he has in other Deep South primaries.

The Jackson Clarion-Ledger says turnout is expected to be only light to moderate, but still higher than the 2004 primary when John kerry had already sewn up the nomination. The polls close at 8 p.m. ET.

Here are the latest polls:

ARG: Obama 54%, Clinton 38% (March 10)

InsiderAdvantage: Obama 54%, Clinton 37% (March 10)

Rasmussen: Obama 53%, Clinton 39% (March 8)

Hillary Clinton has a new radio ad in Mississippi, specifically about the campaign itself and the momentum she might be enjoying.

"They said she couldn't do it. They counted her out. But Hillary Clinton fought back. And she won big," the announcer says. "Maybe that's why Barack Obama is running false attack ads against her now. But Hillary thinks Mississippians deserve the truth about what she's done and what she'll do."

Obama has been running his own radio ad featuring former Gov. Ray Mabus, attacking Hillary for having previously ridiculed the state of Mississippi during her Iowa campaign.

To listen to the ad, click here.

A Rasmussen poll released over the weekend gives Barack Obama a 14-point lead for tomorrow's Mississippi primary: Obama 53%, Clinton 39%.

The internals shows a racial divide typical of Southern Democratic primaries thus far. Obama leads by an overwhelming 80%-12% among black voters, while Hillary is ahead 69%-22% among whites.

Now Bill Clinton is saying it. Here he is, floating the idea of a joint Hillary-Obama ticket at a town-hall meeting today in Mississippi:

"She said yesterday and she said the day after her big wins in Texas and Ohio and Rhode Island that she was very open to that and I think she answered explicitly yes yesterday," Clinton began, referring to Hillary's own answers on the topic in recent days.

"I know that she has always been open to it, because she believes that if you can unite the energy and the new people that he’s brought in and the people in these vast swaths of small town and rural America that she’s carried overwhelmingly, if you had those two things together she thinks it’d be hard to beat. I mean you look at the, you look at the, you look at the map of Texas and the map in Ohio. And the map in Missouri or -- well Arkansas’s not a good case because they know her and she won every place there.

"But you look at most of these places, he would win the urban areas and the upscale voters, and she wins the traditional rural areas that we lost when President Reagan was president. If you put those two things together, you’d have an almost unstoppable force."

Via the Page. Note the extent to which he volunteered her thinking on this. This report suggests that he offered this in an answer to a question. But Hillary floated this yesterday, and, now, Bill today -- and it's hard to imagine that both Clintons would be talking this up in tandem by accident.

Separately, Newsweek's poll today finds that 69% of Dems support the idea.

Late Update: Obama himself rejected the possibility that he'd serve as veep:

Obama was asked by a television reporter, "Can you ever see yourself on the same ticket as Sen. Clinton?"

And the freshman Illinois senator replied: "Well, you know, I think it’s premature. You won’t see me as a vice presidential candidate -- you know, I’m running for president. We have won twice as many states as Senator Clinton, and have a higher popular vote, and I think we can maintain our delegate count."

The first public poll is out for this Tuesday's primary in Mississippi, a state where Barack Obama is favored to win.

The American Research Group poll puts Obama way at 58% support, against Hillary Clinton's 34%. Granted, ARG's record for primaries this cycle has been spotty. Nevertheless, it would be pretty hard to get it totally wrong on a margin this big.