From ABC:
After Wednesday night's festivities ended, there was a minor elevator mishap at the Pepsi Center that involved [Sen. Hillary Rodham] Clinton (D-N.Y.), sources tell ABC News.

Apparently, the elevator got stuck between floors, stranding Sen. Clinton and others for several minutes. The doors needed to be pushed open and those in the elevator -- including Sen. Clinton -- needed to be lifted and squeezed out.

Clinton was seen leaving the scene looking a tad shell-shocked, but an aide says, "She's fine."