**Sloppy Service:** Two cars from Vice President Joe Biden’s Secret Service motorcade struck a pedestrian in Maryland early Wednesday morning. The victim was hospitalized and later died. *Thumbs Down***Speaking Out:** The American Medical Association voted Tuesday to oppose the U.S. military’s “don’t ask, don’t tell” policy. *Thumbs Up***Achoo!:** Lauren Johnson, a 12-year-old from Virginia, has been suffering from “machine gun sneezing” for two weeks. The condition causes her to sneeze 12,000 times daily, and has no known remedy. *Thumbs Down***Elmo’s World:** Michelle Obama recently visited the set of “Sesame Street” to commemorate the show’s 40th anniversary. She will costar with Elmo in a public service announcement on healthy habits. *Thumbs Up***Facebook Alibi:** Prosecutors dropped robbery charges against a Brooklyn teenager after Facebook traced his status update at the time of the crime to his father’s computer. *Thumbs Up*”