Show us these polls you are quoting. Here is the latest from RCP; You numbers are not even clost to what these recent and legitimate polls show.
If Iowa falls to Perry there could be a serious momentum swing. While Perry wont win NH he could spend 3 weeks campaigning in SC while Huntsman, Gingrich and Paul make life hell for Romney in NH.
South Carolina is not a firewall for Perry and neither is Florida. Perry has money and groundwork to take this as far as he wants.
Newt, Bachmann and Santorum need money to continue after SC. Perry is saying I am staying in until there is only me and Romney and you can all choose between us.
Newt is not now nor was he ever going to go anywhere. He simply doesn't have enough solid support, not even from the voter. He's just the "not Romney" flavor of the week. He has less money than Ron Paul and wont get any from anyone. It's not like Cain where average voters were sending him cash. The big party guys are funding Romney.