We did this already. When polled about their next choice, Gingrich supporters split almost evenly between Mittens and Santorum.
That was some time ago. Now, after all the conservative endorsements of Romney from Ryan, Rubio, GHWB, etc, DeMint....Newt's supporters have already started to leave Newt for Romney because the know the increasing importance to get this over with and start gaining a campaign against Obama.
You will find that ratio to be much higher lately. Which is already showing in the polls in Wisconsin. Newt supporters are headed for Romney by as much as 2 to 1
Newt Supporters are Newt supporters for a reason; They are smart enough to figure this out in advance, on their own.