Lautenberg collapsed from a bleeding ulcer

The culprit behind Sen. Frank Lautenberg's (D-N.J.) Monday trip to the emergency room was a bleeding ulcer, according to a statement from his office Tuesday.

Lautenberg was rushed to the hospital on Monday night after taking a fall at his home.  He underwent a successful endoscopy, a diagnostic procedure that examines the inside of the gastro-intestinal tract, and he's expected to make a full recovery and be back to work soon.