The Potomac Primaries are over, and McCain and Obama have swept their respective primary contests in Virginia, Maryland, and Washington, D.C.

Obama has swept today's state primaries, beating out Clinton in Louisiana, Nebraska, and Washington. Huckabee's not quite as likely to get a sweep, as he's a bit behind in Washington, but he's already been declared the victor in Kansas and Louisiana.

The Democratic and Republican primary races are each coming three states closer to having selected their candidate.

Exactly how do you miss on a three-billion dollar budget estimate by over a billion dollars?

Super Tuesday is over. Need I say more?

At 98% of precincts reporting, Obama had just taken the vote lead in Missouri with about 4,000 votes. We're up to 99% of precincts as of approximately a minute ago, and his lead's gone up to 7,000. We're calling Missouri for Obama.

Looks like McCain's picked up California and Missouri. Romney's picked up Montana — not that it probably matters much; MSNBC's reporting (on TV; no link yet) that Romney's looking at having "frank discussions" about the state of the campaign tomorrow, and has already started canceling events after Thursday.

Astute readers will note that there's a new member of our right-hand column: the Who's Winning Where segment, which will list up-to-the-minute info on who's winning what states this crazy Tuesday. Newest additions will be in bold.

ABC's calling Obama as the winner in Illinois -- one of the big states as far as delegates go. Clinton may have taken Oklahoma, though NBC's saying it's too close to call; she's also the projected winner in Tennessee.

On the Republican side, McCain has Connecticut, Illinois, and New Jersey; Huckabee has West Virginia and Romney has Massachusetts.

The Mailbag returns, with questions that you might expect with Super Tuesday right around the corner: national politics, VP choices, and the Republicans' problem with McCain.