Andrew Ross McMahon is a singer/songwriter. He was the vocalist, pianist and primary lyricist for the bands Something Corporate and main songwriter for Jack's Mannequin and performs solo both under his own name as well as moniker Andrew McMahon in the Wilderness. Wikipedia*
On the C-SPAN Networks:
Andrew McMahon has one video in the C-SPAN Video Library; the first appearance was a 2000 Judicial Proceeding.