There isn't any "law" saying anchor babies are citizens - just bad judicial precedent. If anyone stops treating them like citizens, they won't be breaking any law, because there is none. Rather the leftwing would sue, which is good because the likely result is that bad precedent would be overturned.
The law is there, claiming that it is not is foolish.
It is spelled out in the 14th Amendment, and found again in the US Code in Title 8, Chapter 12, Subchapter III, Part I, § 1401.
Just because you find the interpretation to be wrong, does not negate that the Supreme Court disagreed with you and that what is in place in actually the law.
Simplistic. If congress passes the law, then obozo has to ask himself if he wants to oppose poll after poll opposing the illegal alien invasion AND congress. As a crafty politician from the Chicago democratic machine, and with the 2012 election considered, he probably wouldn't isolate himself in that way: obozo against the country.
"If" Congress passes the law, a major if... and what polls on this issue exactly are you referring to?