I think any one of the three left could take out Romney if they were the lone conservative. I would go with any of them if they catch fire, but I am hoping that will be Newt. They're all flawed, but I think he would be our best candidate of those running. I'd support one of the others if they get to the top of the polls in the next two weeks.
As usual, you and I are on the same page regarding the dynamics of this race.
Like you, I would give my support to any of the three remaining conservatives should the other two bow out, but I honestly feel that of the three, Newt stands the best chance of knocking out Romney. Of that group, he would also make the better president for these times.