The president-elect is headed to the weekly Senate Democratic lunch meeting today to make his case for a release of the second half of the financial bailout money. It sounds like news -- after all, as the AP reports, Barack Obama is "putting his persuasion skills to a high-stakes test" with today's visit. But what makes the lunch date in itself significant? Here's my take.

These Tuesday lunches, held by both Democrats and Republicans, are a well-known ritual in the Capitol, often allowing senators to air their most candid concerns about the agenda -- whether on or off the record -- with the passel of reporters who wait outside the door to the meeting room. Obama's appearance as the guest of honor at a Tuesday lunch, then, is a symbol of his dizzying rise. For some Dems, this will be the first time it truly sinks in that the guy who started out ranked 98th out of 100 in the Senate is now calling the shots. In a building where seniority rules the day, this is bound to sting on some level.

Also, Senate lunch appearances are a key part of the president's public-relations role. George Bush dined with the Senate on the eve of the pivotal immigration vote, but otherwise left the mealtime courtship to Vice President Cheney or other White House aides. That Obama is making the trip before his inauguration is an undeniable show of respect for Congress.

One note about the Tuesday lunches: They are possibly the most choreographed element of the highly staged congressional work week. If Obama wants to answer questions, look for him to head to the microphones set up in the Senate's "Ohio Clock Corridor," located just outside the formal chamber. If he doesn't want to answer questions ... he'll be gone.