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People. hundreds are dead. many more were sickened. >> what exactly is involved in chemical weapons and how do they work? our senior medical correspondent elizabeth cohen joins us, and we have seen the pictures. >> it is horrible. it is just horrible. so the way that it works is we all, our glands and muscles have an off switch. they're not always on. a nerve gas turns off the off switch and makes your glands and muscles constantly working. that's not good. they actually get tired and that's why you get paralysis and you get death. that's the mechanism of it. it can happen very quickly with th...

On or off switch. it is an ongoing challenge that all of us have to be concerned about. >> you know, i come to realize something. every time president obama said i want to make something clear, he doesn't make it very clear. it is ineffable when he said let me be clear. be prepared you see a fog coming over. here is a president who took the initiative in saying that if there is chemical withins that is a game changer and a red line and we'll really do something. in all of this, the president reminds me of the united nations. the un has a wonderful history of someone acting up. the un will say ...

So, you know, this is not an on or off switch. it is an ongoing challenge that all of us have to be concerned about. >> you know, i come to realize something. every time president obama said i want to make something clear, he doesn't make it very clear. it is ineffable when he said let me be clear. be prepared you see a fog coming over. here is a president who took the initiative in saying that if there is chemical withins that is a game changer and a red line and we'll really do something. in all of this, the president reminds me of the united nations. the un has a wonderful history of someon...

So, you know, this is not an on or off switch. it is an ongoing challenge that all of us have to be concerned about. >> you know, i come to realize something. every time president obama said i want to make something clear, he doesn't make it very clear. it is ineffable when he said let me be clear. be prepared you see a fog coming over. here is a president who took the initiative in saying that if there is chemical withins that is a game changer and a red line and we'll really do something. in all of this, the president reminds me of the united nations. the un has a wonderful history of someon...

Greatest terrorist attack since 9/11. >> i want to talk about syria. we will talk about this in the next smet length with the israeli ambassador. i want to ask you guys about it as well. after stating the use of chemical weapons was a red lien this week president obama seemed to back off that. take a look. >> this is not an on or off switch. this is an ongoing challenge that all of us have is to be concerned about. >> chris: senator manchin, as a member of the senate the armed services committee are you, first of all, persuaded that the assad regime did use chemical weapons and what do you mak...