Steve Jobs was raised by parents wealthy enough to send him to Reed College. His biological parents were grad students who (I believe) later became professors (or at least his father did). None of those people were working McDonald's jobs with no prospects for anything better.
Barack Obama? You're citing Barack OBAMA? That would be the same Barack Obama who was raised by his banker grandparents, sent to a fancy private school (current tuition: $22,000/year), then through Columbia and Harvard?
Yep. McDonald's all the way, there, dude.
In any case, citing people who overcame poverty does not refute the overall point. In fact, the only reason we tell stories about these people is because they are rare exceptions. I mean, Stevie Wonder is a great musician who happens to be blind. That doesn't mean we should intentionally make more people blind in the hope of producing more Stevie Wonders. Neither should we encourage people living in poverty to have children that they cannot afford.