That seems to contradict his previous position. Asked in a 2004 questionnaire, "Should the government crack down on businesses that hire illegal immigrants as major part of overhaul?" Obama answered "Oppose."
Obama campaign spokesman Bill Burton explained that his boss' position has evolved because of the advent of "tamper-proof electronic employment verification systems" that would make cracking down on businesses that hire illegal immigrants a more realistic option.
"Those employers have never been given the necessary tools to distinguish which workers are legally here and which are not," Burton said, explaining that Obama has tried to take the lead on the new technology during congressional debates over illegal immigration.