Earlier quoted context omitted.
He's also against the President being allowed to execute US citizens with out charge or trial.
And against gay marriage, too! His defenders will claim that although he does not like it, he will still allow it. But that's not true either, because he will leave it to the states to decide (and about half of them will decide to ban it). Private prisons? Have at it. Urban poverty? Let the charities deal with it. Access to abortion? Similar response to gay marriage. The only reason he's popular on the internet is be…
As far as private prisons I think his views on sentencing are much more relevant. I think people being sentenced to less time and those who have non-violent offence being released are more important than whether the prison is owned and operated by the gov't.
As far as popularity he's the only Republican that outpolls Clinton in many swing states. (Not sure if you were insinuating that he's only popular on the internet)
He's a huge advocate of fixing urban poverty by not removing working parents from their home to serve lengthy sentences for non-violence offences.