Several storylines emerged Monday on the last full day of campaigning before Tuesday's Iowa caucuses.
Front-runner Mitt Romney is trying to tamp down an upstart threat from Rick Santorum. Santorum was trying to shoulder past Ron Paul, who has been running a close second to Romney but now has Santorum nipping at his heels.
Paul is calling his rivals' attempts to discredit his foreign policy and other views as desperation and demagoguery.
Rick Perry is to trying to keep Santorum from pulling away from a three-way tie with him and Newt Gingrich by questioning Santorum's voting record on earmarks in the Senate.