Obama takes the gloves off, tries comedy

(CNN) - Democrat Barack Obama launched sharp - and at times bitingly sarcastic - attacks at presidential rivals Hillary Clinton and John Edwards in Nevada Friday.

In comments he first introduced on the trail Thursday night, Obama chastised Clinton for trying to make an issue of the fact he admitted at a recent debate he is at times disorganized, and mocked both Clinton and John Edwards for what they offered as their "weaknesses."

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- CNN's Alexander Mooney and Chris Welch