Lightning Round: ISIS Pharmaceuticals, Chesapeake Energy, Windstream and More

ISIS Pharmaceuticals : Jim Cramer likes this stock, but only on a speculative basis.

Chesapeake Energy : When it comes energy stocks, Cramer currently prefers Southwestern Energy because he considers it a "pure nat gas play."

American Capital Agency : Cramer thinks this stock could continue to go lower. He'd still hold onto shares, though.

Windstream : Go with CenturyLink instead of Windstream, Cramer said.

Kinder Morgan Energy : The "Mad Money" host hit the "buy, buy, buy!" button for this stock.

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