TPMmuckraker has all the relevant footage from today's hearing. Each link will bring you to a page with a descriptive context of the clip in question:
Sampson Testifies about Conversation with Gonzales about Iglesias
Sampson Suggested Removing Fitzgerald
Sampson Explains Rove's Role in U.S. Attorney Nomination
Whitehouse Questions Sampson about His Experience
Schumer Questions Sampson about Gonzales Remarks
Sampson Didn't Think of "Perception Problem"
Feinstein Questions Samspon on Lam Firing
Sampson on the Patiot Act Provision
Specter Asks Sampson about What "The Problem" with Carol Lam Was
TPM is constantly updating the video list so you can check back for others.