Cory Booker

AGE: 39
OCCUPATION: Mayor of Newark, N.J.
PREVIOUS APPEARANCES ON THE TIME 100: 0

PRO: The seemingly indefatigable Booker is using New Jersey's largest city as a lab for innovations in housing and small-business growth. His approval ratings bode well for his 2010 re-election campaign, and his national profile is growing.

CON: Crime was down in 2008, but further economic woes could send the numbers back up.

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