Cramer's lightning round: NRG Energy is a buy - CNBC

"Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

NRG Energy Inc: "I still like it. I am a buyer of NRG." Science Applications International Corp: "Excellent consulting company. Maybe I'd wait a little ... for it to maybe go down a little bit befor… [+142 chars]

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