Obama's Prime Time News Conference
President Bush's first White House news conference was on Feb. 22 - but it was at 240pm in the afternoon, in the Briefing Room.
Mr. Bush's first prime time news conference, by contrast, was not until Oct. 11, 2001 - nearly nine months into his presidency.
Mr. Obama's press conference this evening is also notable for the varied number of news organizations given seats.
Major U.S. news organizations were limited to one seat each. Among those also getting a seat: 538.com, Gray Communications, Air America, Ed Schultz (liberal radio talk show host), Al Jazeera, Essence, Saudi Press Agency, Scoop44.com and America Blog.
Mark Knoller is a CBS News White House correspondent.