Immigration, comprehensive reform

Obama is on Face the Nation right now.  He wants "immigration reform" and is saying that if Congress doesn't do it, he will do it by executive order.  He isn't saying what kind of reform he wants.  In fact there are a lot of angles to immigration, some of them acceptable to the voters and a lot of them not acceptable.   A whole bunch of voters see immigrants as competitors for jobs, education, and wages. They fear immigrants will work for less, and depress their wages.  Unions see things this way.  "Progressives" see immigrants as potential democratic voters. 
Angle 1.  Legalizing the 10 or 11 million illegals in the country right now.  Or legalizing some of them.  Or just letting them alone, give up trying to deport them.  Or legalizing the kids, or college graduates or veterans.
Angle 2.  Allowing more workers, farm workers, programmers and high tech workers in.  Industry and growers are all in favor of this.  There is a shortage of farm workers who will do the hard work for little money.  There is always a shortage high tech workers.
Angle 3.  Revise immigration policy to favor the young, the educated,  over family members.  Current policy favors the elderly parents of citizens over young workers who can man our industries.
Angle 4.  "Securing" the border.  Nobody has said just how secure they want.  Do they want to build something like the Berlin Wall across the Mexican border?  Me, I'd settle for a chain link fence, a perimeter road, and daily patrols.
Angle 5.  How many immigrants will we accept each year?  10,000? A million?  3 million?

A comprehensive immigration bill might say something about all the angles.  Which requires Congressmen to come to agreement as to what angles go into the "comprehensive" bill.  It might be easier to pass a "non comprehensive" bill which just addresses the few angles that we can get some agreement on.