That is why Newt is staying in. To insure that Romney gets 1144 delegates.
He never meant to stay in to the convention. See today, he says he is staying in until Romney gets 1144. Newt knows he won’t get the nomination at a brokered convention.
If Romney gets 1144 there is no brokered convention, Newt gets out it’s over. If Romney doesn’t get 1144 then there is a brokered convention and Newt stays in.