There are a lot of us who will not vote for Newt. He talks a good game, but is sadly ineffective or even contradictory to the goals of conservatism once in power.
In a head to head match up against Obama Newt polls worse even then Paul.
Why? Because rightly, or wrongly, the perception in voters minds is he is just another DC Establishment suit. They see Newt as part of the same political class that created our current problems.
Be stupid politics in the current political environment for the GOP to nominate someone 0bama can credibly paint as "part of the Wall Street/GOP Political Establishment that wrecked the economy" in voter's minds.