expecting record cold as we go into early next week, with dangerous cold temperatures even across the south. norah: important information. mike bettes, thank you. on the right, now to that blockbuster political news, just days away from the iowa caucuses, former new jersey governor chris christie announcing just a short time ago he is suspending his campaign for the republican nomination. christie has been promising to do whatever is necessary to keep donald trump from winning the republican nomination. cbs s ed o keefe reports tonight from des moines. it s the right thing for me to do. reporter: in an impassioned speech tonight, chris christie said he was reluctant to exit but can no longer see a path to victory and didn t want to help donald trump get back to the oval office. i m going to make sure that in no way do i enable donald trump to ever be president of the united states again. and that s more important than my own personal ambition. [applause] reporter: the former