It's been the problem all along. Too many irons in the fire. Too many candidates to dilute the chance of any one really taking on Romney who can't sustain over 25% for any length of time. But that's meant the Romney opposition has been divided, both nationally and here on FR.
Now that the field's being winnowed, I'm hoping Romney's negatives will become far too cumbersome for him to turn this around. But that would be insured by a Santorum resignation and subsequent support of Gingrich.
My biggest fear is Romney. I sincerely believe that Gingrich can overcome him and win the nomination, but why make it more difficult than it has to be? Santorum must drop out.