The president is in Boulder, Colorado giving a campaign-style speech at the University of Colorado. Reportedly, on his way to the speech, he decided to stop for a bite at "The Sink ... a divey kind of place that seems more about the beer than the food," according to the the pool report. The report continues:
While greeting people outside, a young woman spilled yogurt on the president. It appeared to hit his pants. The president wiped himself off with a towel and made a wry comment about the Secret Service, but pooler couldn't hear his exact words.
He did say to the woman, "Getting yogurt on the president, you've got a story to tell."
She said, "I'm very embarrassed."
UPDATE: And here's a picture: