Ouch! 15 worst-performing stocks

It's been a long road down for Western Refining, whose stock peaked in the heady days of the summer of 2007, when both crude oil and gasoline prices soared. Both eventually fell when the weak economy suppressed demand.

But the cost of crude bounced back faster than the price at the gas pump -- squashing margins for refiners. Western Refining issued 20 million new shares in June, a move that spurred its stock to fall further.

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