Yep, and how many of those natural born hispanic Americans are the children and grandchildren of illegal immigrants? The Democrats have been bragging about the demographic shift towards those in favor of their policies for years, how do you think they are getting that shift? Even if illegals can't vote, their kids can and their kids are going to vote for those who promise amnesty to their older family members.
This is not to say that there aren't Hispanic families that have been here for generations and generations, but if you think that those that are here directly or indirectly as a result of illegal immigration are not a significant portion then I don't know what else to say to you on the matter.
I guess it's fun when it happens in your favor, but would you be happy if the population being added was in favor of more hardline conservative stances? Immigration is only one issue.