Since almost all the witnesses have copped a plea deal, the accused--former chief executives Kenneth Lay and Jeffrey Skilling --took the stand themselves, and since there's no smoking gun, there should be no shortage of fodder for both sides to orate upon.

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"They're never easy cases, there's no smoking gun, " ACLU of Arizona legal director Dan Pochoda said of the class-action suit.

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Advocates for tighter gun laws argue there's no need for Americans to own the powerful rifle, but the gun's proponents say the AR-15's accuracy makes it safe.

CNN: Gun store nixes Mark Kelly's AR-15 purchase