I don't doubt the results of this poll at all. I think it reflects public opinion pretty accurately.
But it doesn't present all of the options. It is typical of these polls to frame the debate as though it is a choice between a path to citizenship or mass deportations, when the truth is that there are other options. You can call it Attrition or Enforcement First, but it is a viable alternative, and polling that has presented it as an option has shown it to be more popular than the path to citizenship.
And it is bizarre that so many conservatives/Republicans would apparently support a path to citizenship and increased amounts of future legal immigration seeing as how it will only empower the Democrats by swelling their number of voters.