States shouldn't make separate immigration laws

http://latino.foxnews.com/latino/politics/2011/04/27/obama-states-immigration-laws/
This article mentions of how several states across the country are wanting to develop their own form of "immigration law" just like how Arizona did but are like being put aside because President Obama doesn't want there to be a variety of immigration laws. First of all, i think that if this is allowed there will be a whole lot more of problems and possible riots, which thankfully haven't occurred so far, and also many will have to adapt to each law when it comes to moving to certain states across the country. There isn't a need for a lot of immigration laws everywhere and why not first try to come up with a better solution to this issue instead of going into "law-making" first? The laws aren't really required and it's not so much kicking out immigrants or making their lives impossible but to come up with a sort of compromise that can ease up the issue.