Yesterday morning, before the debate happened, George Borjas wrote that

It will be interesting to see how the candidates walk their way through the long and winding minefield. At the same time, they will have to acknowledge the increasingly unforgiving mood of the general public towards illegal immigration, the apparent divergence between non-Hispanics and Hispanics on this issue, and the fact that (for most candidates) their current positions on illegal immigration seem at odds with positions taken just a few months ago.[The Borjas Blog: Republicans On Immigration]

And of course, if their current positions are at odds with the ones they held a few months ago, they could also be at odds with the ones they take after they're in office. See under "Bait and Switch" in your dictionary.