this is decision day in iowa. just four hours from now, republicans will gather in caucuses across the state and cast the first votes in the 2012 campaign. the candidates have spent months of the trial paving the way with millions in campaign cash. much of that money has gone towards a barrage of negative advertising. now, in a final flurry of appearances, the rhetoric has reached a new peak or maybe a new low. you said mitt romney, somebody who will lie to you to get to be president will lie to you when they are president. i have to ask you, are you calling mitt romney a liar? yes. you re calling mitt romney a liar? you seem shocked by it. yes. why are you saying he s a liar? this is a man who s staff created the pack. his millionaire friends fund the pack. he pretends he has nothing to do with the pack. it s balogna. it s like his pretense that he s a conservative. wow. let s go live to our chief political correspondent, candy crowley. she s in des moines. you