Where once Mr Bush's political machine seemed invincible, now it cannot get anything right.

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Just four years ago, a surging Dell seemed invincible after hustling to dominance in the PC business.

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Afterwards he said they were getting a vibe from the crowd, and in the words of their own song they really seemed invincible.

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"We thought we were invincible because the low-carb trend seemed so solid, " says Saltzman, 36.

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