Even if your screwy obsessions about Imam Obama were true, someone at DHS/BP/ICE would leak the story in a heartbeat if any ISIS/AQ/Generic Islamist were captured in TX. You ignore the fact that all the loony right "evidence" for this claim predates ISIS existence.
Correct, ISIS/ISIL/SI, the current Islamic radicals emboldened and supported initially by Obama and McCain are not the only Islamic radical group, or terrorists. Unless you believe previous terroristic acts were done by "weird energy weapons by Cheney" some other non-sense Islamic immigrants, some of whom were illegal, have committed terrorist acts. The Obama administration itself says that there are thousands of student visa Muslims that are unaccounted for and over-stay.
But, again, you ignore my point. Even if not a single Islamic radical, ISIS member, or even Muslim comes across our open-border how many murders, rapes, child abductions, fatal DUI accidents, diseases, and $$$ for education, healthcare, and imprisonment of the illegals (and their brood) is it worth? Simply to get some more future voters for a certain party, to help Balkanize the country, or to get some cheaper labor?