Evening News Online, 04.27.12

      |The Secret Service is cracking down on the behavior of its agents, issuing a new code of conduct for agents on drinking, visiting questionable establishments and more; Also, the people of New York City were witnesses as the Shuttle Enterprise (atop a 747 plane) flew over the city's landmarks en route to its final destination; And, Steve Hartman catches up with an unusual rancher Charles Kuralt met a few decades back.