There isn't much new in the Washington Post story today about Obama's tease yesterday that he has chosen his No. 2. Reporter Anne Kornblut does suggest that the campaign wants to get as much mileage out of McCain's recent housing gaffe before announcing:

Although his advisers would like to wait as long as possible before overshadowing the controversy over McCain's inability to say how many houses he owns, Obama is expected to announce his vice presidential decision by Saturday. His campaign has scheduled a joint appearance in Springfield, Ill., where he announced his presidential bid more than a year and a half earlier.

It is unclear whether Obama and his vice presidential choice will travel together from there. Earlier in the campaign, advisers suggested it was likely that the running mate would travel apart from the presumptive nominee for a little bit before making a separate arrival at the Democratic National Convention in Denver.

On Thursday, Obama's campaign mapped its plan for his arrival, saying he will visit battleground states between Sunday and Wednesday, when he gets to Denver. On his travel schedule: Eau Claire, Wis., on Sunday; the Quad Cities area of Iowa on Monday; Kansas City, Mo., on Tuesday; and Billings, Mont., on Wednesday. He will head into Denver later on Wednesday, toward the end of the Democratic convention.

Earlier Thursday, Virginia Gov. Timothy M. Kaine and Obama had a quick private meeting in Richmond before making a joint appearance at an outdoor town hall meeting. Afterward, they were quiet about the substance of their talk, providing no indication whether Kaine, widely believed to be a front-runner to join the ticket, is the vice presidential choice.

Although the campaign is probably as impatient at the press for the announcement, you have to admire its discipline. Combined with McCain's gaffe, Obama is owning the coverage leading up to the convention. Saturdays are tricky media days though, and I would expect the announcement to come this morning to both drown out whatever might be coming from the McCain campaign and to hype tomorrow's rally in Springfield.