One of the little-noticed political endorsements from last week was that of former Ronald Reagan chief of staff, Kenneth Duberstein, who broke with his party to endorse Barack Obama. Why did he do this? The far more influential, Colin Powell, helped break the ice for Duberstein. And Duberstein was clearly not thrilled with the pick of the delightfully chipper, Sarah Palin, as VP, telling MSNBC, "Even at McDonalds (NYSE: MCD), you're interviewed three times before you're given a job."

But it could be that Duberstein had a much more practical business reason for endorsing Obama -- a $35 billion contract for Boeing Inc. (NYSE: BA) of which he is a director. And Boeing stands to lose that contract if McCain is elected. How so? John McCain's national finance committee chair, Tom Loeffler, is a lobbyist for a French company that is competing with Boeing for the contract to build airborne refueling tankers for the Air Force. McCain's campaign received $14,000 in contributions from workers at EADS, the parent of France's Airbus, which is competing against Boeing in a joint bid with Northrop Grumman (NYSE: NOC) for the contract.

My sources suggested that McCain was behind the process irregularities that caused the General Accounting Office (GAO) to recommend that the bidding process be canceled and the contract rebid back in June. And there's little doubt that if McCain wins tomorrow's election, he is in the tanker tank for Airbus and it will cost Boeing the contract. So could Duberstein believe that Obama is a better candidate for the country? Absolutely. And would an Obama victory be better for Boeing than for France's Airbus? Sure.

Peter Cohan is President of Peter S. Cohan & Associates. He also teaches management at Babson College and edits The Cohan Letter. Portfolio will publish his book about Boeing, You Can't Order Change: Lessons from Jim McNerney's Turnaround at Boeing, in December 2008. He has no financial interest in the securities mentioned.