Democratic presidential candidate Sen. Barack Obama D-Ill., left, and his vice presidential running mate Sen. Joe Biden, D-Del., appear together Saturday in Springfield, Ill. (M. Spencer Green / Associated Press)
The Democrats’ presumptive presidential nominee and his choice for vice presidential running mate -- Sens. Barack Obama of Illinois and Joseph R. Biden Jr. of Delaware -- in Springfield Ill., during their first public appearance together as campaign partners. (Joe Raedle / Getty Images)
