literally growing more violent by the hour. how the u.s. is reacting as the crackdown on the rebels intensifis. this is serious, serious stuff. martha: back home to politics, the final four battling it out but romney get the what he needed last night to gain the frontrunner status? karl rove will join us in a few minutes. we'll get a take what happened last night. >> we must not allow iran to have a nuclear weapon. if they do the world changes america will be at risk and some day nuclear weaponry will be used. if i'm president that will not happen. if we reelect barack obama, it will happen. [applause] vegetable nutrition? ♪ [ gong ] strawberry banana! [ male announcer ] for a smoothie with real fruit plus veggie nutrition new v8 v-fusion smoothie. could've had a v8.