I think that you forget that they are supposed to be three candidates at each other's throats and wanting to do battle in debating each other. Interesting that you merely see them as a single team against Newt.
I still think Newt is great. He might even be winning if it weren't for so many idiots following him kissing his butt driving normal people away in droves. I think some of Paul's nutty followers got tired of the stench of pot smoke and converted their batty attraction over to Newt.