I marched with you in the streets of Chicago to meet our immigration challenge. I fought with you in the Senate for comprehensive immigration reform. And I will make it a top priority in my first year as President – not only because we have an obligation to secure our borders and get control of who comes in and out of our country. And not only because we have to crack down on employers who are abusing undocumented immigrants instead of hiring citizens. But because we have to finally bring undocumented immigrants out of the shadows. Yes, they broke the law. And they should have to pay a fine, and learn English, and go to the back of the line. That’s how we’ll put them on a pathway to citizenship. That’s how we’ll finally fix our broken immigration system and avoid creating a servant class in our midst.
--Barack Obama

Call me obtuse, why do we have to "bring them out of the shadows," and how is it they "go to the back of the line" by being legally jump-frogged over everyone who obeyed our laws to start with? How is rewarding this behavior going to stop the behavior and fix our "broken immigration system"? If we grant yet another amnesty, won't that just be an incentive for more Mexicans to cross the border illegally - just as happened last time?

McCain's position is exactly, depressingly, the same.