David Plouffe, campaign manager to Democratic presidential hopeful Sen. Barack Obama (Ill.), will deliver a special briefing this afternoon to Democratic Senators on the state of race.

The 4:45 p.m. meeting, to be held at the Democratic Senatorial Campaign Committee headquarters, comes on the same day that Obama is in Washington for key Senate votes on the Foreign Intelligence Surveillance Act and the Medicare doctors’ fix. Obama spent much of the morning talking to colleagues on the floor during a series of votes, which will continue later today.

According to the invitation, the meeting is taking the place of a “standing weekly call” to Senate Democrats. The private session, which Obama’s Illinois colleague and campaign co-chairman Sen. Dick Durbin (D) helped organize, is open to the entire Senate Democratic Caucus.

Obama has been slowly putting together a general election blueprint that involves coordination with House and Senate Democrats on message and strategy. On Monday, the campaign announced its four-person Congressional liaison team led by longtime aide to Rep. Henry Waxman (Calif.), Phil Schiliro.