He was one of six speakers announced early this morning by the DNC, and one of four current or former governors on the program.
That year the Democrats nominated Massachusetts Sen. John Kerry for president. And another young star also took the stage: Barack Obama.
Other speakers for this year's convention announced today include: Chicago Mayor Rahm Emanuel, CA Attorney General Kamala D. Harris, CO Gov. John Hickenlooper, former VA Gov. Tim Kaine, Kerry, MA Gov. Deval Patrick, former Ohio Gov. Ted Strickland.
They will join: Former President Bill Clinton, Elizabeth Warren and San Antonio Mayor Julian Castro (the keynote speaker.)
The DNC did not say when O'Malley will take the stage. The committee also promised to unveil additional speakers and details in coming days -- which may come as a relief to other rising Democratic stars who haven't made the list. Like NY Gov. Andrew Cuomo.