Get unlimited digital access to $0.99 for 4 weeks.

Officer David Robertson, Metra Police Department

Robertson and Officer Lyndell Luster are old hands at the Obama detail, having worked security for the senator during his last election. Luster says he joked with Obama at the time about whether he'd be president one day. "Hey, little brother," Luster recalls Obama saying. "One election at a...

Tribune photo by E. Jason Wambsgans