Newt challenged Romney so in a way he has made Romney stronger. Without Newt there, would there have been another strong candidate to go toe-to-toe with Mitt in a credible way? Would Romney sort of be coasting and thus in a way weaker? Would Santorum have gotten more traction, perhaps enough to be the lone anti-Romney. Would a different candidate without Santorum's religious negatives and without Newt's career, temperament & family values negatives have decided there was room in the field for him to enter?