Newt's remaining 5%, are dedicated pragmatic Conservatives who don't like Santorum in any way, nor do they like the “R” word and they hope to at least force a brokered convention. So if Newt drops out, they will either go to Paul or split evenly between Santorum and the “R” word.
Voting for Newt is ensuring a Romney win, not a brokered convention. Rick needs every vote he can get if the end goal is a brokered convention and not a Romney victory.
So that’s your decision that you have to make. If you sincerely believe that a Romney nomination is in the best interests of the GOP - go ahead, vote for Newt in good conscience.
Otherwise, Rick’s your best bet at this point.
OR, do like myself, and write in Palin...