jane harmon, thank you very much.your insights. >>> and republican candidates are pushing foreign policy for a tougher policy against iran. urging the white house to heed calls from congress and slap new sanctions on tehran's central bank. >> when you sanctioned the iranian central bank, that will shut down that economy. at that particular point in time, they truly have to deal with the united states. >> i think it's a good idea -- i think replacing the regime before they get a nuclear weapon without a war beats replacing the regime with a war which beats allowing them to have a nuclear weapon. >> sanctions aren't going to work because the chinese aren't going to play ball and the russians aren't going to play ball. and i believe iran -- they have decided they want to go nuclear. >> david cohn, and the treasury, tim geithner and hillary clinton this week imposed tighter sanctions on iran, but not as tough as some have wanted. why not go after the central bank the way president sarkozy of france has suggested and other

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