The Senate's Subcommittee on Antitrust, Competition Policy and Consumer Rights is holding a hearing on the XM-Sirius merger, today at 2:15pm ET.

Witnesses scheduled to attend include, of course, Mel Karmazin (from the Sirius camp), Mary Quass (from NRG Media, also on the NAB's Board of Directors), David Balto (anti-trust guru), and Gigi B. Sohn (President of advocacy group Public Knowledge).

There's a summary of Public Knowledge's position on the merger available here. Personally I'm in full support of all the terms PK is suggesting.

At first glance there doesn't appear to be a webcast of this hearing. If anyone knows of one, please let us know.
UPDATE: CapitolHearings.org should have a webcast, or check C-SPAN 2 (via Sirius Uplink)