The great libertarian former governor of Massachusetts:

William Weld said he's never endorsed a Democrat for president before, but in the last six weeks or so, it became "close to a no-brainer." Obama has a history of bringing Democrats, Republicans and independents together and is the best choice at a time when America's standing in the world is at a low point, he said.

"It's not often you get a guy with his combination of qualities, chief among which I would say is the deep sense of calm he displays, and I think that's a product of his equally deep intelligence," he said in a phone interview.

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