Please don't flame me... but listening to the President, he has mention border control many times... I don't think he has the political support for that where it counts. In the Senate.
Everytime the Justice Department tries to stiffen immigration, the Senate screams bloody murder.
So, where as the President realizes that borders are a problem... it's not an issue he can win right now. Those on the border realize its a problem, but their Senators and their state legislatives do not. That's where it has to change for any Federal law can have effect.
I'm not a Bushbot... so don't flame me... This is just my opinion.