Who will be the Democrats' Eastwood?

U.S. first lady Michelle Obama "fist-bumps" actor and Obama administration official Kal Penn, the associate director of the White House Office of Public Engagement, as she tours the stage a day before her speech to the Democratic National Convention in Charlotte, North Carolina, Sept. 3. (REUTERS/Jim Young)

Bill Clinton is going to be delivering one of the most important speeches of the convention, but no one in the Democrat camp knows what he's going to say.

This is, understandably, a source of frustration for the Democrats.

"Clinton is the only major speaker yet to submit his address to the typically painstaking vetting and rewriting that typically accompanies major convention addresses, provoking a mild and growing dose of nerves among senior Democrats," said a Democratic official to BuzzFeed Monday.

Maybe it will be Kal Penn, the 35-year-old Harold & Kumar stoner star and one-time House regular, that keeps the DNC interesting.

"His starring role comes Thursday when he’s hosting a web-only convention special which will include interviews with campaign officials and Obama supporter celebs including singer Marc Anthony, film actress Elizabeth Banks, CBS’ The Talk cohost Aisha Tyler, TV/film actress Olivia Wilde, The Nanny and now TVLand sitcom star Fran Drescher, TV/film star Zach Braff, and Gilmore Girls‘ Alexis Bledel," reports Deadline Hollywood.

My bet is on Zach Braff going rogue.