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Fred W. Smith, Founder and CEO, FedEx
Smith, an ex-Marine, runs a global enterprise of staggering logistical complexity. And McCain has said he'd make a good Defense Secretary.

But Smith doesn't always back McCain, parting ways recently on a proposal to temporarily lift the federal gas tax.

Said Smith: "I'm an ardent supporter of Senator McCain, but I don't agree with him on everything.... Will it have any major effect on the energy crisis? The answer to that is no."

NEXT: Meg Whitman Former CEO, eBay
Last updated July 28 2008: 5:20 PM ET
The inside story of how the candidate is shaping his plan to fix the economy. (more)
He slammed big companies and free trade in the primaries, but Barack Obama insists he just wants to show corporate America some tough love. (more)

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