That's a load of crap, and that's why people are eternally perplexed on this issue.
It's important in this forum, and important near the borders...but that's about it.
If you are going to believe in polls (which we generally and unilaterally discredit, unless of course we agree with their findings), immigration is considered to be an important issue by roughly 5% of the America people.
You don't get around much do you? If you did, you'd find out the anger is increasing across the board on this issue. Americans that are truly informed on this march to national suicide are solidly against illegal immigration for many reasons that should be obvious to anyone with half a brain. I know that leaves out many folks who listen/watch to the MSM useful idiots or those working for "the race". If your #'s were even close (which they aren't) initiatives like PROP 200 in AZ would never have passed (which it did).
I don't know where you got that 5% number, every number that comes up in a search is above 2/3 to 70% to 90%. For example, just one link:
"Moreover, public opinion polls taken over the last five years have consistently found that roughly 70 percent of Americans think the United States should not make it easier for illegal aliens to become citizens (Figure 4)."