The eight women and four men began deliberations late Wednesday morning and have issued only two brief written notes, which suggested they are methodically reviewing the evidence against the former chief of staff to Vice President Dick Cheney.
CBS News Justice Department reporter Deirdre Hester reports that the jury sent a note out Wednesday requesting supplies. They asked for a large flip chart, masking tape and Post-It notes. In a second note Thursday, they asked "may we please get any one of the documents where pictures of the witnesses are."
In addition to obstruction of the leak investigation, Libby is charged with lying to the FBI and a grand jury about how he learned and whom he told about CIA operative Valerie Plame.
He faces up to 30 years in prison if convicted, though he'd likely get far less under federal sentencing guidelines.
Plame is married to former Ambassador Joseph Wilson, who emerged in mid-2003 as an outspoken critic of the Bush administration's case for the Iraq war.
Prosecutors say he concocted a story to avoid losing his job for disclosing classified information to reporters without authorization. Libby said he gave investigators his best recollection of what happened and any errors resulted from memory flaws.