The Secret Service traditionally has given pithy, private names to those whose lives they protect. The monikers are a throwback to a time when electronic communications were not encrypted, and they no longer serve a security function. Still, they give an occasional peek at the players' personalities, in addition to serving as great trivia questions.
President-elect Barack Obama: R E N E G A D E
Now, lets compare this to past Presidents:
Dwight Eisenhower - Scorecard or Providence
John F. Kennedy - Lancer
Richard Nixon - Searchlight
Gerald Ford - Passkey
Jimmy Carter - Lock Master/ Deacon (close 2nd place in my opinion for best)
Ronald Reagan - Rawhide (yee frickin' haw Gorbachev)
George H. W. Bush - Timberwolf
Bill Clinton - Eagle
George W. Bush - Tumbler (I'll let J.N. take care of this one)