They can try but it’s going to happen anyway with the influx of “new” non-legal Americans.
Check it out:

The New Hampshire GOP is using the hot-button issue of jobs and immigration to help Scott Brown squeak ahead of incumbent Democrat Sen. Jeanne Shaheen in their neck-and-neck race.

“The Obama-Shaheen plan brings in millions of lower-paid workers to compete for your jobs and wages,” says one get-out-the-vote online ad, which also carried an image saying “New Hampshire Workers Need Jobs.”