The former governor endorsed Clinton when she was running for the Democratic nomination against then-senator Barack Obama in 2008. Now in the past six months, he's struggled to draw Democrats' support away from her.
The night before O'Malley launched his presidential campaign he released a web video showing him picking "Hail to the Chief" on a guitar. Before that, he used mobile video streaming app Meerkat to broadcast a concert by his band.
Will O'Malley's guitar make it to the debate stage Tuesday? We'll find out.