Jennifer O'Malley-Dillon
40u40 electors jennifer omalley
Age: 36

Deputy campaign manager, Obama for America

The field-organizing whiz who led the charge for Obama in 2008 battlegrounds is back at it for the President. Inside the reelection campaign's Chicago headquarters, she's chief deputy to top-dog Jim Messina. But her most important charge is readying the ground game in swing states, where Democrats are counting on a superior effort to help them overcome the spending edge Republicans are expected to enjoy.

--Tory Newmyer

- Last updated October 11 2012 03:33 PM ET
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Fortune's 40 Under 40

Who are 2012's young business stars? We've got the CEO of a blue-chip beer brand, an airline CEO who just placed the largest order in commercial aviation history, and Warren Buffett's new prodigy, among the Silicon Valley hotshots and others.

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