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korea plans to launch a long-range rocket. why tensions are soaring ahead of a world nuclear summit. i m wolf blitzer. you re in the situation room. captions by vitac www.vitac.com on this, the eve of a key gop primary in louisiana, rick santorum is charging hard. polls show him as a double digit favorite there, but santorum is also on the defensive today. he s taking a lot of heat from his rivals for hinting that reelecting barack obama might might be preferable to electing mitt romney. listen to this. you win by giving people a choice. you win by giving people the opportunity to see a different vision for our country, not someone who is just going to be a little different than the person in there. if they re going to be a little different we might as well stay with what we have instead of taking a risk of what may be an etch a sketch candidate for the future. strong words. let s go live to our senior correspondent joe johns. he s in louisiana. joe, i tak ....