Latino Decisions and America's Voice have a new polling that should help make the argument that the millions of people who would be helped by a legalization program are likely to quickly integrate in to American culture once they have the chance.

From America's Voice:

Today, Latino Decisions released an initial installment
of this poll, showing the undocumented community's deep ties to American
citizens, their reasons for migrating to the United States and their strong
desire to become full-fledged American citizens.  As Latino Decisions lays
out in a blog
post about the poll, "85% of undocumented immigrants have a family member
who is a US citizen" and "77% came to the United States for better economic
opportunity or to create a better life for their family."  Additionally,
"When asked what they would do if the law changed to allow a process for them
to eventually apply for citizenship, an overwhelming 87% indicated their
intention to become a U.S. citizen."