KEY POINTS:
Saying Barack Obama embodies political hope absent since Robert Kennedy was killed 40 years ago, three surviving members of the Grateful Dead have reunited to back the presidential candidate.
"Every few generations, a guy like this comes along," percussionist Mickey Hart said. "The last time hope was in the air, it was ended by a bullet," Bob Weir said, referring to Kennedy, who was assassinated on the night he won the California Democratic primary in 1968.
